Aicardi’s Diseases of the Nervous System in Childhood, 4th Edition
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About this ebook
This classic text on paediatric neurology is now in its fourth edition. Leading academics from around the world present evidence from their various areas of expertise, placing it firmly in the clinical context. Each chapter covers the basic science of the disorder and relevant genetic advances. New to this edition are chapters on fetal neurology, movement disorders, basal ganglia disease and psychogenic disorders. References at the end of each chapter are thorough, guiding the clinician to relevant further reading. The international team of editors has maintained the clinical approach of the late Jean Aicardi, which distinguishes this book from others in the field. Succinctly given, patient-focused information makes Aicardi’s Diseases of Nervous System in Childhood a comprehensive yet readable resource for busy clinicians in paediatric neurology, general paediatrics, neurodisability and all the related medical disciplines.
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Aicardi’s Diseases of the Nervous System in Childhood, 4th Edition - Alexis Arzimanoglou
Clinics in Developmental Medicine
Aicardi’s Diseases of the Nervous System in Childhood
Clinics in Developmental Medicine
Aicardi’s Diseases of the Nervous System in Childhood
Edited by
Alexis Arzimanoglou
University Hospitals of Lyon
France
with
Anne O’Hare
The Salvesen Mindroom Centre
University of Edinburgh
UK
Michael V Johnston
Kennedy Krieger Institute
Baltimore, MD
USA
Robert Ouvrier
Children’s Hospital
The University of Westmead
Sydney
Australia
2018
Mac Keith Press
© 2018 Mac Keith Press
2nd Floor, Rankin Building
139-143 Bermondsey Street,
London SE1 3UW
Managing Director: Ann-Marie Halligan
Consultant Editor: Hilary Hart
Production Manager: Udoka Ohuonu
Project Management: Riverside Publishing Solutions Ltd
The views and opinions expressed herein are those of the author and do not necessarily represent those of the publisher
All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical, photocopying, recording or otherwise, without the prior consent of the copyright holder or the publishers
First edition 1992
Second edition 1998
Third edition 2009
Fourth edition 2018
British Library Cataloguing-in-Publication data:
A catalogue record for this book is available from the British Library
Cover image by J Livet and JW Lichtman, Centre for Brain Science, Harvard University, Cambridge MA, USA
ISBN: 978-1-909962-80-4
Contents
Jean Aicardi (1926–2015)
Jean Aicardi: A Brief Curriculum Vitae
About the Editors
Authors’ Appointments
Preface to Third Edition
Preface to Fourth Edition
Acknowledgements
PART 1Fetal and Neonatal Neurology
1.Fetal Neurology
Adré J Du Plessis and Michael V Johnston
Neuroembryology
Normal Neural Tube Development
Disorders of Neural Tube Development
Normal Rhombencephalic Development
Disorders of Rhombencephalic Development
Cerebellar Hemispheric Malformations
Normal Prosencephalic Development
Disorders of Prosencephalic Development
Disorders of Prosencephalic Cleavage
Disorders of Midline Prosencephalic Development
Disorders of the Fetal Choroid Plexus and Ventricles
Disorders of the Choroid Plexus
Normal Cerebral Cortical Development
Disorders of Cerebral Cortical Development
Developmental Disorders of Neuronal Proliferation
Disorders of Neuronal Migration
2.Neurological Diseases in the Perinatal Period
Miriam Martinez-Biarge and Linda S de Vries
Intracranial Haemorrhage in the Term Infant
Germinal Matrix–Intraventricular Haemorrhage in the Preterm Infant
White Matter Injury
Hypoxic–Ischaemic Encephalopathy
Focal Lesions (Neonatal Stroke)
Bilirubin Encephalopathy
Metabolic Insults: Neonatal Aspects
Neuromuscular Diseases
Skull Fracture, Cephalhaematoma and Other Consequences of Mechanical Skull Trauma
Neonatal Disorders of the Spinal Cord
PART 2Brain Malformations, Neurocutaneous Syndromes, Genetic Anomalies and Dysmorphic Syndromes
3.Developmental Brain Malformations
Nadia Bahi-Buisson and Nathalie Boddaert
Disorders of Ventral Induction
Holoprosencephaly
Conditions Related to Holoprosencephaly
Malformations of Cortical Development
Malformations Secondary to Abnormal Neuronal and Glial Proliferation or Apoptosis
Disorders of Migration
Malformations due to Abnormal Cortical Organisation
Abnormalities often Associated with Disorders of Cortical Development
Agenesis and Dysgenesis of the Corpus Callosum
Septo-Optic Dysplasia
Colpocephaly
Midbrain–Hindbrain Malformations
Predominantly Cerebellar Malformations
Cerebellar and Brainstem Malformations
Predominantly Brainstem Malformations
Predominantly Midbrain Malformations
Prenatal Diagnosis, Treatment and Prevention of Brain Malformations
4.Neurocutaneous Diseases and Syndromes
Eleni Panagiotakaki and Alexis Arzimanoglou
Neurofibromatoses
Neurofibromatosis Type 1
Neurofibromatosis Type 2
Other Forms of Neurofibromatosis
Tuberous Sclerosis Complex
Linear Nevus and Related Syndromes
Classic Linear Nevus Syndrome
Related Syndromes with Proliferative Skin and Subcutaneous Tissue Lesions
Neurocutaneous Syndromes with Prominent Vascular Components
Sturge–Weber Syndrome
Syndrome of Haemangiomas and Other Cardiovascular Defects (PHACES Syndrome)
Von Hippel–Lindau Disease
Hereditary Haemorrhagic Telangiectasia (Rendu–Osler–Weber Syndrome)
Rare Neurocutaneous Syndromes with Prominent Vascular Component
Syndromes with Various Cutaneous or Subcutaneous Tissue Anomalies
Ataxia-Telangiectasia and Related Disorders
Disorders Related to Ataxia-Telangiectasia
Neurocutaneous Syndromes with Abnormal Pigmentation
Incontinentia Pigmenti (Bloch–Sulzberger Type)
Incontinentia Pigmenti Achromians (Hypomelanosis of Ito)
Neurocutaneous Melanosis
Other Neurocutaneous Syndromes with Abnormal Pigmentation
Neuroichthyosis Syndromes
Sjögren–Larsson Syndrome
Trichothiodystrophy
Miscellaneous Neurocutaneous Syndromes
Nevoid Basal Cell Carcinoma (Gorlin-Goltz Syndrome)
Progressive Hemifacial Atrophy (Parry–Romberg Disease)
Lipoid Proteinosis (Urbach–Wiethe Disease)
5.Genetic Anomalies and Dysmorphic Syndromes
Karine Pelc and Bernard Dan
Down Syndrome
Fragile X Syndrome
Rett Syndrome
Angelman Syndrome
Prader–Willi Syndrome
The 22q11.2 Deletion Syndrome
Williams Syndrome
Cornelia De Lange Syndrome
Noonan Syndrome
Turner Syndrome
Klinefelter Syndrome
Smith–Magenis Syndrome
Sotos Syndrome
Cri-Du-Chat Syndrome
Kabuki Syndrome
PART 3Neurological Consequences of Prenatal, Perinatal and Early Postnatal Interference with Brain Development
6.Osseous Malformations of the Skull and Craniovertebral Junction
Richard Hayward and Dominic Thompson
Osseous Malformations of the Skull
Craniosynostosis
Craniosynostosis & Craniofacial Syndromes
Disorders of the Craniovertebral Junction
The Craniovertebral Region
Specific Diseases Associated with Craniovertebral Anomalies
Treatment of CranioVertebral Junction Disorders
Normal Variants of the CranioVertebral Junction
7.Hydrocephalus and Non-Traumatic Pericerebral Collections
Andrew Whitelaw and Christian Sainte-Rose
Hydrocephalus
Classification, Age and Presentation of Hydrocephalus
Hydrocephalus Presenting in the First Postnatal Year
Diagnosis of Hydrocephalus
Treatment of Hydrocephalus in Infants
Non-Traumatic Pericerebral Collections
8.Cerebral Palsy and Related Movement Disorders
Ingeborg Krägeloh-Mann
Pathology, Aetiology, Pathogenesis
Classification of Cerebral Palsy
The Various Types of Cerebral Palsy
Diagnosis and Differential Diagnosis of Cerebral Palsy
Positive Diagnosis
Differential Diagnosis of Cerebral Palsy
Acquired Hemiplegia
Diagnostic Difficulties and Early Diagnosis
Treatment and Management
Prediction of Motor Function and Early Intervention
Management of Cerebral Palsy and Quality of Life
Meeting the Needs of the Disabled Child
PART 4Metabolic and Heredodegenerative Disorders
9.Metabolic Diseases
Linda De Meirleir
Disorders of Subcellular Organelles
Lysosomal Diseases
Congenital Disorders of Glycosylation
Peroxisomal Disorders
Disorders of Amino Acid and Organic Acid Metabolism
Disorders of Vitamin Metabolism
Disorders of Neurotransmitter Metabolism
Biopterin and Catecholamine Metabolism
Inborn Errors of Gamma-Aminobutyric Acid Metabolism
Nonketotic Hyperglycinaemia
Serine Deficiency Syndromes
Other GABA-Related Disorders
Urea Cycle Disorders
Disorders of Carbohydrate and Glycogen Storage Diseases
Glycogen Storage Diseases
Transporter Defects
Mitochondrial Medicine
Respiratory Chain Disorders
Pyruvate Dehydrogenase Deficiency
Pyruvate Carboxylase Deficiency
Defects in Krebs Cycle
Mitochondrial Fatty Acid Beta-Oxidation Defects
Defects of Cholesterol Metabolism
Disorders of Copper Metabolism
Disorders of Purine and Pyrimidine Metabolism
Purines
Disorders of Pyrimidine Degradation
Disorders of Creatine Synthesis and Transport
Cerebrotendinous Xanthomatosis
Hypotonia–Cystinuria Syndrome
10.Heredodegenerative Disorders
Victoria San Antonio Arce, Jaume Campistol Plana, Alexis Arzimanoglou and Robert Ouvrier
Leukodystrophies
Demyelinating/Dysmyelinating Leukodystrophies
Hypomyelinating Leukodystrophies
Nucleotide Excision–DNA Repair Syndromes
Heredodegenerative Diseases with Diffuse CNS Involvement
Disorders Involving Predominantly the Grey Matter
Poliodystrophies
The Ceroid Lipofuscinoses
The Spinocerebellar Degenerations, Ataxias, Hereditary Spastic Paraplegias and Related Conditions
Autosomal Dominant Forms of Spinocerebellar Ataxias
Autosomal Recessive Forms of Spinocerebellar Ataxias
Differential Diagnosis and Management of Friedreich Ataxia and Other Inherited Ataxias
Hereditary Spastic Paraplegia
Cerebellar Hypoplasia
Non-Progressive Cerebellar Ataxias
Pontocerebellar Hypoplasia
PART 5Postnatal Extrinsic Insults
11.Infectious Diseases
Michael Eyre, Alasdair Bamford and Cheryl Hemingway
Bacterial Infections of the Nervous System
Viral Infections of the Nervous System
Acute Viral Agents
Chronic Viral Infections
Encephalopathies of Obscure Origin That May Be Related to Viral Infections
Prion Diseases of the Nervous System
Mycotic Infections of the Nervous System
Protozoan and Parasitic Infestation of the CNS
Toxin Mediated Disorders
12.Parainfectious and Other Inflammatory Disorders of Immunological Origin
Marc Tardieu and Michael Johnston
Acute Demyelinating Syndromes
Multiple Sclerosis
Antibody-Mediated Encephalopathy
Inflammatory Diseases of the White Matter that mimic Multiple Sclerosis and Related Disorders
Immunogenetic Diseases Mimicking Multiple Sclerosis and Related Disorders
Tumours Mimicking Multiple Sclerosis
Other Genetic Diseases Mimicking Inflammatory White Matter Diseases
Other Inflammatory Diseases of the Central Nervous System
Cerebellitis
Opsoclonus-Myoclonus Syndrome and Other Para-Neoplasic Disorders
13.Accidental and Non-Accidental Injuries by Physical and Toxic Agents
Karen Barlow, Robert Forsyth and Robert Minns
Acquired Brain Injury
Epidemiology
Pathophysiology of TBI
Clinical Assessment of TBI
Measures to Reduce Intracranial Pressure and Maintain Cerebral Perfusion Pressure
Predictors of Outcome
Management and Care
Post-Concussion Syndrome and MILD Traumatic Brain Injury
Spinal Cord Injury
Epidemiology
Outcome
Management Issues
PART 6Tumours and Vascular Disorders
14.Tumours of the Central Nervous System, Other Space-Occupying Lesions and Pseudotumour Cerebri
Colin Kennedy, Aabir Chakraborty and David Walker
Intracranial Hypertension and Its Management
Brain and Other Intracranial Tumours
Characteristics of Individual Tumours
Posterior Fossa Tumours
Brainstem Tumours
Tumours of the Midline and Base of the Brain
Tumours of the Cerebral Hemispheres
Gliomas of the Cerebral Hemispheres
Other Tumours of the Cerebral Hemispheres
Tumours of the Basal Ganglia and Thalamus
Intraventricular Tumours
Embryonal Tumours Other Than Medulloblastoma
Metastases
Non-Metastatic Manifestations of Tumours of Other Organs
Lipomas
Intracranial Cysts and Other Mass Lesions
Spinal Cord Tumours
Other Conditions Related to CNS Tumours
15.Cerebrovascular Disorders
Gabrielle deVeber and Adam Kirton
Arterial Ischaemic Stroke
Risk Factors and Causation of Arterial Ischaemic Stroke
Treatment in Arterial Ischaemic Stroke
Outcomes and Chronic Management in Arterial Ischaemic Stroke
Cerebral Sinovenous Thrombosis
Risk Factors and Causation of CSVT
Treatment and Outcomes in CSVT
Haemorrhagic Stroke
Risk Factors and Causation of Haemorrhagic Stroke
Treatment in Haemorrhagic Stroke
Outcomes in Haemorrhagic Stroke
Specific Vascular Diseases Causing Childhood Haemorrhagic Stroke
PART 7Paroxysmal Disorders
16.Epilepsy and Other Seizure Disorders
Alexis Arzimanoglou and Michael S Duchowny
Terminology and Definitions
Mechanisms of Epileptic Seizures
Aetiology of the Epilepsies
Pathology
Classification Issues
Classification of Epileptic Seizures
Classification of Epilepsy Syndromes
Epileptic Seizures and Epilepsy Syndromes by Age at Onset
Seizures and Syndromes of the Neonatal Period
Seizures and Syndromes of Infancy and Early Childhood
Seizures and Syndromes of Late Childhood and Adolescence
Stimulus Sensitive (Reflex) Epilepsies
Immune-mediated Seizure Disorders
Status Epilepticus
Convulsive Status Epilepticus
Nonconvulsive Status Epilepticus
Refractory Status Epilepticus
Electrical Status Epilepticus of Slow Wave Sleep
Differential Diagnosis From Paroxysmal Disorders Other Than Epilepsy
Anoxic Seizures
Syncopes of Cardiac Origin
Episodes of Apnoea or Bradycardia in Young Infants
Alternating Hemiplegia of Childhood (AHC)
Paroxysmal Disturbances of Consciousness
Acute Psychiatric Manifestations
Seizures of Toxic Origin
Tetany
Investigations in Patients with Epilepsy
Electroencephalography
Neuroimaging in Epilepsy
Treatment of Epileptic Seizures and Epilepsy Syndromes
Education of Parents and Children
Drug Treatment
Non-Drug Medical Treatments
Surgical Treatment of Epilepsy
Prognosis of Epilepsy
17.Headache Disorders in Children
Kenneth J Mack
Primary Headache Disorders
Secondary Causes of Headache
18.Sleep Disorders
Patricia Franco
Paroxysmal Disorders of Sleep
Sleep Apnoea Syndromes
Hypersomnia and Insomnia Syndromes
PART 8Movement Disorders
19.Basal Ganglia Diseases and Movement Disorders
Paddy Grattan-Smith, Russell C Dale and Emilio Fernandez-Alvarez
Clinical Aspects of Basal Ganglia Diseases
Basal Ganglia Radiology
Basal Ganglia Circuits
New Classification Schemes
Dystonia
Classification of Dystonia
Genetic Dystonias with Onset in Childhood
Neurodegeneration with Brain Iron Accumulation
Other conditions that may present with Dystonia
Treatment of Dystonia
Status Dystonicus (Dystonic Storm)
Athetosis and Chorea
Athetosis
Chorea
Tremor
Treatment of Tremor
Myoclonus
Classification of Myoclonus
Clinical Features of Myoclonus
Treatment of Myoclonus
Excessive Startle
Parkinsonism and Hypokinetic Rigid Disorders
Parkinsonism in Infancy
Parkinsonism Appearing after Infancy
Treatable Movement Disorders
Radiological Findings in Basal Ganglia Disease
Basal Ganglia Calcification
20.Tics and Gilles de la Tourette Syndrome
Robert Ouvrier and Russell C Dale
21Non-Epileptic Paroxysmal Movement Disorders
Paddy Grattan-Smith, Russell C Dale, Emilio Fernández-Alvarez
Benign Neonatal Sleep Myoclonus
Shuddering Attacks
Benign Myoclonus of Early Infancy (Fejerman Syndrome)
Unusual Benign Movement Disorders of Infancy
Benign Polymorphous Movement Disorder of Infancy
Benign Paroxysmal Torticollis
Benign Paroxysmal Vertigo
Transient Idiopathic Dystonia in Infancy
Infant Masturbation (Self-Stimulation or Gratification Episodes)
Stereotypies
Paroxysmal Tonic Upgaze
Paroxysmal Tonic Downgaze of Infancy
Sandifer Syndrome
Paroxysmal Dyskinesias
Historical Features
Clinical and Genetic Features of the Paroxysmal Dyskinesias
Approach to Paroxysmal Dyskinesias
Psychogenic Paroxysmal Disorders
PART 9Disorders of the Oculomotor, Visual, Auditory and Vestibular Systems
22.Disorders of Visual and Oculomotor Functions
Carey Matsuba
Disorders of Visual Function
Visual Impairment Overview and Definitions
Aetiologies of Visual Impairment
Nystagmus
Pupillary Conditions
Disorders of Ocular Motor Function
23.Disorders of Auditory and Vestibular Function
Anne O’Hare
Hearing Impairment and Speech Development
Clinical Assessment of Hearing Impairment
Aetiology of Sensorineural Hearing Impairment
Management of Sensorineural Hearing Impairment
Prognosis of Hearing Impairment
Dysfunction of the Vestibular System
PART 10Neuromuscular Diseases
24.Diseases of the Motor Neuron
Mariacristina Scoto and Francesco Muntoni
Chromosome 5-Proximal Spinal Muscular Atrophy
Genetics of 5-Proximal SMAs
Key Diagnostic Features and Differential Diagnosis
Standard of Care in SMA
Newborn Screening for SMA
Approved and Experimental Therapies Aiming at Increasing SMN Protein Levels
Other Therapeutic Approaches
Non-5q Spinal Muscular Atrophies
Other SMAs
25.Disorders of the Peripheral Nerves
Manoj Menezes and Robert Ouvrier
Charcot–Marie–Tooth Disease (Hereditary Motor and Sensory Neuropathy)
Uncommon Neuropathies with Motor and Sensory Involvement
Hereditary Sensory and Autonomic Neuropathies
Recommendations for Genetic Testing in CMT
Complex Neuropathies Associated with Central Nervous System Involvement and Metabolic Neuropathies
Acquired Diffuse Neuropathies
Endogenous and Exogenous Toxic Neuropathies
Endogenous Toxic Neuropathies
Exogenous Toxic Neuropathies
Neuropathies of Systemic and Vascular Diseases
Localised Disorders of the Peripheral Nerves (Excluding Cranial Nerves)
Traumatic Nerve Injuries
Localised Disorders of Cranial Nerves
26.Muscle Disorders
Monique M Ryan, Francesco Muntoni and Kathryn N North
Congenital Myopathies
Congenital Muscular Dystrophies
Progressive Muscular Dystrophies
Dystrophinopathies (Duchenne and Becker Muscular Dystrophies)
Myotonic Diseases and Related Conditions
Myotonic Dystrophy (Dystrophia Myotonica, DM1, Steinert Disease)
Ion Channel Disorders
Inflammatory Myopathies
Infectious Myositis
Metabolic Myopathies
Disorders of Glycogenolysis and Glycolysis – the Glycogen Storage Disorders (GSDs)
Disorders of Lipid Utilisation and Metabolism
Mitochondrial Myopathies
Systemic Myopathies of Childhood
Other Muscle Abnormalities
PART 11Neurological Manifestations of Systemic Diseases
27.Electrolyte and Acid-Base Metabolism Disturbances, Nutritional Disorders and Other Systemic Diseases
Peter Baxter
Disorders of Water and Electrolyte Metabolism
Nutritional Disorders and the Nervous System
Vitamin Deficiencies
Endocrine Diseases
Cardiac Disorders
Pulmonary Diseases and Other Ventilatory Problems
Hepatic Disease
Gastrointestinal Disorders
Renal Diseases
Bone Disorders
Haematological Disorders
Neurological Complications of Allogeneic Bone Marrow and Organ Transplantation
PART 12Developmental and Neuropsychiatric Disorders of Childhood
28.Neurodevelopmental Disabilities and their Management
Bruce K Shapiro
29.Autism Spectrum Disorder and Autistic-Like Conditions
Anne O’Hare and Roberto Tuchman
30.Attention-Deficit–Hyperactivity Disorder and Co-existing Impairments
Bruce K Shapiro
31.Disorders of Speech, Language and Communication
Anne O’Hare
Development Disorders
Verbal Dyspraxia
Dysarthria in Syndromic Conditions
Acquired Disorders of Speech and Language
32.Psychogenic Neurological Disorders
Paddy Grattan-Smith
Difficulties Over Words
Lessons from the Past
Frequency and Presentation of Psychogenic Neurological Disorders
The ‘Positive Signs’ of a Psychogenic Neurological Disorder
Overview of the Signs of a Psychogenic Neurological Disorder
What Is the Underlying Cause of a Psychogenic Neurological Disorder?
Psychogenic? Functional? What Is the Correct Name?
Treatment of Psychogenic Neurological Disorders
Prognosis
Jean Aicardi (1926–2015)
Jean Aicardi, a clinician, clinical investigator and educator, left us on 3rd August 2015 at the age of 88.
Professor Aicardi had a passionate, life-long commitment to child neurology and clinical epileptology. He obtained his medical degree in 1955 at the Faculté de Médecine de Paris. He worked as a Research Fellow at the Harvard Medical School, headed the Pediatric Neurology Unit at the University Hospital Necker-Enfants Malades in Paris, was Director of Research at the French National Institute of Health and Medical Research INSERM (1986–1991) and was an Honorary Professor of Child Neurology at the Institute of Child Health, London UK (1992–1998).
Jean Aicardi was a pioneer in child neurology who contributed significantly to the description of several neurological entities including Aicardi syndrome in 1969; Aicardi-Goutières syndrome in 1984; Rett syndrome (together with Bengt Hagberg); alternating hemiplegia of childhood and others.
He authored or co-authored three internationally recognized books: Aicardi’s Epilepsy in Children, (Aicardi 1987, 1994; Arzimanoglou, Guerrini, Aicardi 2004) Diseases of the Nervous System in Childhood, (Aicardi 1992, 1998, 2009) and Movement Disorders in Children. (Fernandez-Alvarez and Aicardi, 2001). He published 259 articles in major international, peer-reviewed journals, and over 100 book chapters.
He was awarded several academic honors and distinctions including the Hower Award of the American Child Neurology society (1986), the Epilepsy Research Award of the American Epilepsy Society (1995), the Ramon y Cajal Award, the International League Against Epilepsy-International Bureau for Epilepsy (ILAE-IBE) Ambassador for Epilepsy Award and the ILAE-IBE Life Achievement Award.
As a teacher Jean Aicardi believed in what he called the ‘members of the young generation’ and in 1999 he easily accepted the invitation to become the Founding Editor of an epilepsy journal devoted to electro-clinical semiology of the epilepsies, Epileptic Disorders, which today is the educational journal of the ILAE. At various times in his career, he was a member of the Editorial Boards of the journals Brain, Brain and Development, Epilepsia, Neuropediatrics, Pediatric Neurology and Journal of Child Neurology.
Jean Aicardi treated everyone with respect. He was always available and willing to provide thoughtful and humble advice to his colleagues and students, to the families that he deeply respected and the sick children he cared about so much. Aicardi had eight brothers and sisters, two of whom died in infancy and another of whom died in a German labour camp in 1945. He loved and respected his family. He was a loving husband and suffered enormously from the loss of his wife, Jeanne Couturier, in 2011.
A tireless clinician and teacher, ‘Monsieur Aicardi’ will be remembered not only as one of the founders of child neurology but also as the mentor of more than 100 child neurologists all over the world. His clinical ward rounds will remain unforgettable to many of us. He was the one who taught us that ‘a major part of examination, and one too often neglected, consists of watching spontaneous activity of the child … the best manner of assessing CNS function and behaviour’. He strongly believed, and he was so right, that in this era of ubiquitous technology, careful observation of clinical signs and symptoms and their correct interpretation, based upon thorough knowledge, remain as essential as ever.
Jeanne Couturier and Jean Aicardi, 1958
Jeanne and Jean Aicardi with Giuseppe Erba, Mike Duchowny and his daughter Kate. Miami, Florida, 1995
On a more personal note, allow me to thank my mentor and friend. He allowed me to share with him more than 30 years of teaching, discussions on differential diagnosis, on treatment, in writing papers and books. But above all, he shared with me important moments of our private lives. He was always present when I needed him. When the third edition of this book was published in 2009, I had just moved to Lyon to work on the development of a clinical epileptology and neurophysiology department. When he offered me a copy of his book Diseases of the Nervous System (3rd edn) he wrote on the cover page "… Our separation was finally not so hard for me to live with because I am so happy that you finally achieved what you always desired and merited …"
Some years later, when Jean asked me to take over the editorship of the 4th edition of this book, I was terrified but unable to say No
. He helped me in selecting co-editors and authors (and this is an opportunity for me to thank them again). His wish was for the book to remain ‘resolutely clinical’.
Merci Monsieur!
ALEXIS ARZIMANOGLOU
REFERENCES
1.Arzimanoglou A, Guerrini R, Aicardi J. (2004) Aicardi’s Epilepsy in Children 3rd edn. London: Lippincott Williams and Wilkins.
2.Aicardi J. (2009) Diseases of the Nervous System in Childhood. Clinics in Developmental Medicine. London: Mac Keith Press.
3.Fernandez-Alvarez E, Aicardi J. (2001) Movement Disorders in Children. International Review of Child Neurology Series. London: Mac Keith Press.
With Alexis Arzimanoglou, Jaume Campistol-Plana and Emilio Fernandez-Alvarez; Santiago de Compostela, Spain, April 2012.
Jean Aicardi: A Brief Curriculum Vitae
•Born November 8th 1926
•Medical degree, Paris Faculty of Medicine (1955)
•Research fellow, Harvard Medical School Boston, USA (1955–1956)
•Assistant Physician Hôpital des Enfants Malades, Paris, France (1957–1964)
•Assistant Physician Hôpital Saint-Vincent de Paul, Paris, France (1964–1979)
•Maître de Recherche, Institut National de la Santé et de la Recherche Médicale-INSERM (1969–1986)
•Director of Research INSERM and Head Pediatric Neurology Unit, University Hospital Necker-Enfants Malades, Paris, France (1986–1991)
•Visiting Scientist Miami Children’s Hospital, USA, 1993
•Honorary Professor of Child Neurology, Institute of Child Health, London, UK (1992–1998)
MAIN ACADEMIC HONORS AND DISTINCTIONS
•Cornelia de Lange Medalion (Dutch Child Neurology Society)
•Fellow Royal College of Physicians (London)
•Honorary Fellow of the Royal College of Paediatrics and Child Health (London)
•Hower Award (US Child Neurology Society)
•Distinguished Investigator Award (Milken Award) (American Epilepsy Society)
•Honorary Member American Neurological Association
•Ambassador for Epilepsy (ILAE)
•Ramon y Cajal Award (Ibero-American Academy of Child Neurology)
•Peter Emil Becker Award (German Child Neurology society)
•Honoured Guest the XXth Cleveland Clinic Meeting Cleveland USA, 2002
•Honorary Member, European Paediatric Neurology Society, Göteborg, Sweden 2005
•President of the International Child Neurology Association (1990–1994)
•Légion d’Honneur (2009)
ACHIEVEMENTS
•Identified Aicardi’s syndrome in 1969
•Identified Aicardi-Goutières syndrome in 1984
PUBLICATIONS
•Diseases of the Nervous System in Childhood; Mac Keith Press, 1992, 1998, 2009.
•Epilepsy in Children. Lippincott, Williams and Wilkins, 1993
•Aicardi’s Epilepsy in Children (with A Arzimanoglou, R Guerrini) Lippincott, Williams and Wilkins, 2003
•Epilepsy. A Comprehensive Textbook, 2nd edn (with J Engel, TA Pedley, M. Dichter, S. Moshé) Lippincott, Williams and Wilkins, 2007.
•Movement Disorders in Children (with E. Fernandez Alvarez) Mac Keith Press, 2001.
•Epilepsy and Movement Disorders (with R Guerrini, F Andermann M. Hallett) Cambridge University Press, 2002.
•Founding Editor and Editor-in-Chief, Epileptic Disorders (1999–2004)
•259 articles in international peer-reviewed journals
•111 book chapters
About the Editors
Professor Alexis Arzimanoglou is the Director of the Department of Paediatric Clinical Epileptology, Sleep Disorders and Functional Neurology at the University Hospitals of Lyon, France and Visiting Professor at the Universitat de Barcelona, Spain, coordinating the Epilepsy Research Program at the Hospital San Juan de Déu. He graduated from the Salonica University, Greece, trained in Neurology at Great Ormond Street Hospital, London, UK and at the Hôpital de la Salpetriere and in Child Neurology as a fellow of Jean Aicardi at the Hôpital des Enfants Malades in Paris, France. He then worked with Jean Aicardi for over 25 years. He served as Chair of the Scientific Committee of the European Paediatric Neurology Society; Editor-in-Chief of the International League Against Epilepsy (ILAE) educational journal Epileptic Disorders and Elected member of the European Commission of the ILAE. Together with Jean Aicardi and Renzo Guerrini he authored Aicardi’s Epilepsy in Children. He received the Ambassador for Epilepsy Award from the ILAE and the Aicardi Award for excellence in Paediatric Neurology from the EPNS. He is the editor of seven books and an author or co-author of nearly 150 scientific articles in the fields of cognition and medical and surgical treatment of childhood epilepsies.
Professor Anne O’Hare is Professor of Community Paediatrics and Director of the Salvesen Mindroom Centre for Learning Difficulties, at the University of Edinburgh. She is a developmental paediatrician with extensive clinical experience in neurodisability, neuroscience and child protection. Her research interests include how neurodevelopmental conditions impact on the development of speech, language, communication, motor skills and learning and the development of effective interventions.
Professor Michael V Johnston is a Professor of Neurology, Pediatrics and Physical Medicine and Rehabilitation at the Johns Hopkins University School of Medicine and the Chief Medical Officer and the Blum Moser Endowed Professor of Pediatric Neurology at the Kennedy Krieger Institute in Baltimore, Maryland, USA. He trained in paediatrics, neurology and neuroscience at Johns Hopkins University School of Medicine, and his clinical and research interests include fetal and neonatal neurology, as well as care for older children with cerebral palsy and neurogenetic disorders including Rett syndrome. He has been active in the development of strategies to protect the developing brain from hypoxic-ischaemic injury. He is one of the founding faculty members of the Neurosciences Intensive Care Nursery (NICN) research and clinical care group at Johns Hopkins Hospital, and he has also been a leader of the Phelps Cerebral Palsy Center at the Kennedy Krieger Institute.
Professor Robert Ouvrier is Emeritus Professor of child Neurology at the University of Sydney. After training in general paediatrics in Sydney, Perth and Papua-New Guinea, he undertook specialist training in child neurology at the Royal Children’s Hospital, Melbourne, the University of Kentucky (1969-70) and the Johns Hopkins Hospital, Baltimore USA (1971-72). He was then Head of the Department of Neurology at the Children’s Hospital at Westmead, Sydney for 25 years. In 1999, he became the Foundation Head of the Institute for Neuroscience and Muscle Research at The Children’s Hospital, Westmead. He was President of the International Child Neurology Association from 2006-2010. He is the author of two books, thirty book chapters and an author or co-author of over 150 scientific articles on paediatric neurology.
Authors’ Appointments
Preface to Third Edition
Diseases of the nervous system in infancy and childhood have a profound impact on the life of patients and their families and are probably the most disruptive of all paediatric ailments. Around 20–30% of hospitalized paediatric patients have a neurological problem, either as a sole or as an associated complaint. However, many well-educated paediatricians not infrequently feel uncom-fortable and hesitant about how to treat children and what to tell to parents of patients with neurological disorders.
Diseases of the Nervous System in Childhood is meant for physicians with an interest in paediatric neurological diseases, whether paediatricians, neurologists, child neurologists or physi-cians dedicated to developmental medicine, and deals only with diseases of the nervous system (as indicated by its title). It is res-olutely clinically oriented but, when necessary, some notions concerning pathogenesis and mechanisms are provided.
This third edition has been extensively updated to cover the tremendous volume of new information collected over the past 10 years, while trying to maintain the size of the book within reasonable limits. In spite of considerable efforts the speed of acquisition of new information is such that no textbook can pre-tend to be really up to date with respect to the very latest data. Electronic databases fulfil the need for ‘last minute’ results, but in a fragmentary and often uncritical manner. Books, on the other hand, aim to give a different, more global and balanced overview of a subject, taking into account the relative importance of the various parts, and assessing and selecting the material in the light of the experience of authors. I believe this synthetic and critical process is more essential than ever in view of the abundance of the material available.
The rapid increase of new data necessitated some rearrangements of this book. Unlike in the earlier editions where I had principally edited all the chapters, I felt this was no longer possible and invited Dr Martin Bax and Professor Christopher Gillberg to be co-editors with me, and they viewed all the ma-terial. In addition, whereas previously I had taken responsibility for the majority of chapters, we decided it was necessary to invite more collaborators to author certain chapters. We are very grateful to those who have given their time and knowledge for the completion of the book.
As before we have not included a chapter on the neurological examination of infants and children. Excellent books and mono-graphs on these topics are available (e.g. Cioni and Mercuri 2008). We have also omitted the chapter on fetal neurology as this highly specialized area of paediatric neurology is also well covered by a number of texts (e.g. Hill and Volpe 1989, Levene et al. 2001).
I wish to introduce this book with a few remarks, based on a 40-year experience, on what could be termed the ‘philosophy’ of paediatric neurological examination. In this age of ubiquitous technology, I strongly believe that collection of clinical data and their correct interpretation remain as essential as ever.
In the first place, the eminent importance of history taking needs to be re-emphasized, as the history of the disease – as well as that of the child from conception and that of his/her family–forms the initial and most important step of the diagnostic approach. For most conditions, the diagnosis is established by thorough clinical history even before, and much more frequently than by, examination (Dooley et al. 2003). History taking is a dif-ficult art requiring careful listening, patience, clinical acumen and understanding. It also necessitates a thorough knowledge of which information is worth looking for, and constant attention to possibly revealing words that may occasionally emerge out of a casual or even apparently irrelevant conversation.
This emphasis on history taking does not in any way minimize the essentiality of neurological examination, which should be as thorough as possible and largely guided by historical data. However, in children, and especially in infants or neonates, it cannot be conducted systematically as in adults. Attempts at ‘adult-type’ examination will lead to crying and fussing. Much of the examination should not require that the child be lying, as the lying position will often frighten the child by reminding him/her of previous unpleasant experiences and prevent the gathering of more important information on central nervous system functioning. After all, the vertical posture has been a major evolutionary acquisition and, since the emergence of Homo erectus, most human activities take place in the standing position.
Indeed, a major part of examination, and one too often ne-glected, consists of watching the spontaneous activity of the child. While an early example of observation is of neonatal and early infantile general movements, which have been shown to have predictive value (Ferrari et al. 1990, Einspieler and Prechtl 2005), later observation should be watching children’s sponta-neous activity with special emphasis on how they relate to their surroundings and to other children or adults, the duration of their capacity of attention, and their verbal or preverbal communica-tion. Playing or interacting with the child is the best manner of assessing CNS function and provides information not only on purely neurological function but also on behavioural problems, which is clearly essential for the diagnosis of the behavioural syndromes that are currently taking a major place in child pathology. Advantage can be taken as often as possible of video-recording for prolonged observation of children’s behaviour and is also particularly useful for the precise study of transient events such as seizures as it allows leisurely and repeated analysis of the ictal phenomena.
It cannot be overemphasized that the basic role of the nervous system is to produce not just reflexes but above all complex and adaptive behaviours that are much more informative on the status of the central nervous system than elementary responses to imposed stimuli. This is best achieved by prolonged observa-tion of the qualitative aspects of the spontaneous activities of the children or infants. All too often, the child is examined but not looked at.
Spectacular advances in medical technologies made over the past decades have revolutionized and enormously increased our diagnostic possibilities, both pre- and postnatally (and recently even in pre-implantation diagnosis), and also improved follow-up surveillance far beyond what could be imagined 20 years ago. Neuroimaging, especially MRI, has become an almost rou-tine investigation, and with continuing improvements and new developments such as diffusion-weighted MRI, tensor tractog-raphy, functional MRI and MR spectrography can now provide information not only on the anatomy but also on the function of some of the central nervous system structures. Biochemical progress in the molecular structure of proteins and the advent of molecular genetics allow a precise diagnosis of many genetic dis-orders even in the absence of clinical manifestations, represent-ing an entirely new field opening new perspectives in diagnosis and prevention. However, at the same time, the availability of these multiple techniques has made the task of choosing among the possibilities offered much more difficult. Investigations should not be performed indiscriminately or systematically but only after formulation of one (or a limited number) of diagnos-tic hypotheses, arising mainly from history and clinical findings, with a view to validate or reject them on the basis of their con-frontation by clinical and laboratory data. Clinical medicine is and must remain an intellectual process whereby all sources of information, whether clinical stricto sensu or arising from tech-nical aids, are used to formulate a diagnosis that will lead to the best possible care of the patient. One’s last task is to communi-cate and discuss our, sometimes complex, findings with the pa-tient and their family. I hope this new edition of Diseases of the Nervous System in Childhood will help the clinician to carry out his/her tasks effectively.
JEAN AICARDI
Paris, September 2008
REFERENCES
Cioni G, Mercuri E (2008) Neurological Assessment in the First Two Years of Life. Clinics in Developmental Medicine No. 176. London: Mac Keith Press.
Dooley JM, Gordon KE, Wood EP, et al. (2003) The utility of the physical examination and investigations in the pediatric neurology consultation. Pediatr Neurol 28: 96–9.
Einspieler C, Prechtl HF (2005) Prechtl’s assessment of general movements: a diagnostic tool for the functional assessment of the young nervous system. Ment Retard Dev Disabil Res Rev 11: 61–7.
Ferrari F, Cioni G, Prechtl HF (1990) Qualitative changes of general move-ments in preterm infants with brain lesions. Early Hum Dev 23: 193–231.
Hill A, Volpe JJ (1989) Fetal Neurology: International Review of Child Neurology. Philadelphia: Lippincott, Williams & Wilkins.
Levene MI, Chervenak FA, Whittle M, eds. (2001) Fetal and Neonatal Neurology and Neurosurgery, 3rd edn. London: Churchill Livingstone.
Preface to Fourth Edition
Jean Aicardi (1926–2015) authored the first edition of Diseases of the Nervous System in Childhood, which was published in 1992. Professor Aicardi was one of the most insightful clinicians of his time, who had witnessed the birth of child neurology as an entirely new field of medicine. His book rapidly became a premier reference tool for those clinicians around the world who were fascinated by the highly complex field of study – the developing nervous system.
Only six years later in his preface to the second edition (1998), Aicardi wrote "… the pace of progress both in medicine and in communication techniques has been so fast in the past few years that there are those who wonder whether books are still useful. They argue that new data are accumulating so rapidly that only computerized databases and networks can permit users to keep abreast of current developments in basic and clinical sciences, and that books are irredeemably condemned to be outdated even at the time of publication".
A third edition followed in 2009 because, as Aicardi was already arguing in 1998, "… immediate availability of such an overwhelming volume of information may be a mixed blessing as assessment of the quality and relevance is left to the judgement of each user, whereas books may be of some help in soliciting the most important data and giving an idea of their organization and significance, assuming that the author’s choices are backed by a certain experience and provided they are not excessively biased".
As Editors of the fourth edition our first challenge was to respect, and as much as possible reproduce, the resolutely clinical orientation of the previous editions. All authors were free either to update the chapters or completely rewrite them, under one condition, that, as Aicardi did, they target the clinical readers. As with the previous editions they were asked to contribute to a reference book for practising child neurologists that would also provide a comprehensive overview for those training in child neurology.
We are happy to acknowledge that, in this era of genomic medicine, all authors respected the fact that understanding the phenotypic spectrum of the huge variety of disorders of the child’s nervous system remains of paramount importance. Family history-taking needs to be taught to all those who wish to practise child neurology. A thorough clinical and physical examination is the second indispensable step towards diagnosis.
The combination of these two steps represents the optimal road to the formulation of a diagnostic hypothesis, then followed by the selection of the most appropriate laboratory and/or imaging investigations and the correct interpretation of the impressive quantity of complex results provided by all types of screening.
The structure of the book was globally respected, but some important changes have been implemented in this fourth edition. The chapter on Fetal Neurology (missing from the third edition) has been reintroduced. Movement disorders, previously discussed in different chapters, are now treated in a dedicated section to better reflect recent advances in the field. Some of the paroxysmal disorders other than epilepsy have also been treated separately and the section on developmental and neuropsychiatric disorders has been modified.
We also respected the wish of Aicardi and deliberately did not include a specific section on the neurological examination of infants and children at various ages or give data on maturation of the nervous system. There are already Excellent books and monographs on these topics.
We are also conscious of the fact that almost unavoidably (considering where nearly all authors and editors were located) the book mainly focuses on child neurology in high-income countries. However, we believe that by respecting the clinical approach, as Aicardi did, a large part of the content will also be useful to those colleagues working in countries where technical facilities are not optimal or may be lacking altogether.
Our aim was not to provide an exhaustive review for each disorder; only some notions on pathogenesis and mechanisms are provided. Nowadays, for each of the disease categories the reader can access other high-quality books and review articles, both in print and/or electronic versions. We, therefore, favoured a comprehensive description of clinical findings to permit diagnostic orientation, prognosis and management.
We also respected the style of the previous editions by providing, per chapter, a rather broad selection of references for further reading. At this point, allow us to thank the publishers for having agreed to respect the space-consuming alphabetical arrangement of the references. Being clinicians ourselves we know, when reading a chapter, how much more convenient it is to immediately identify who wrote a given reference and when. We also believe that having to hand a source of valuable references might prove to be at least as useful as searching in online. In that respect, and although all references were updated, we also asked the authors to include, whenever possible, seminal articles rather than ‘copying and pasting’ references to review publications.
Physicians caring for children with rare or common neurodevelopmental, disorders must keep in mind that a ‘disease’ will always be defined as a disorder of structure or function typically manifested by distinguishing signs and symptoms, with aetiology probably being the most important factor influencing prognosis and outcome. Each diagnostic investigation, taken alone, no matter how sophisticated, provides only a hint towards diagnosis.
Child neurology is reaching a turning point. During its early adolescence the discipline focused on description of numerous disorders. Identifying and homogeneously classifying, as best as possible, these disorders led to a better understanding of underlying mechanisms and to the development of global care practices.
In the 21st century, the development of new technologies needs to be perceived not just as an easy road to diagnosis but as a tool for a better understanding of the causes and as a support for research in discovering novel treatments that will improve the clinical management of affected children.
We remain grateful to Jean Aicardi for his pioneering work. We would like to thank all our co-authors and the publishers for having accepted the challenge to maintain his teaching as reliably as possible, ensuring that it is available for future generations of child neurologists.
ALEXIS ARZIMANOGLOU
ANNE O’HARE
MICHAEL JOHNSTON
ROBERT OUVRIER
March 2018
Acknowledgements
Editors
ALEXIS ARZIMANOGLOU
I am grateful to the families of my patients who during all these years entrusted me with their most precious children and taught me how to listen. Allow me also to acknowledge my own family and personal friends for their constant support. A huge thank you
to my students who later became my friends and colleagues practicing child neurology in so many different parts of the world. Particularly those with whom I had the pleasure to co-author some of the chapters of this book. Last but not least, I will always be grateful to all those colleagues from whom I learn and keep appreciating their advice: members of the Child Neurology Departments of the San Juan de Déu Hospital in Barcelona, the Robert Debré and Necker-Enfants Malades Hospitals in Paris, the HFME hospital in Lyon; the members of the Société Européenne de Neurologie Pédiatrique, the International League Against Epilepsy, the European Paediatric Neurology Society, the American Epilepsy Society, the U-Task force for paediatric epilepsy surgery, the steering committee of the European Reference Network EpiCARE; all co-authors of this book and my team full of excellence at the University Hospitals of Lyon. I am confident they will recognise themselves. Merci.
ANNE O’HARE
I am grateful to my co-authors Bruce Shapiro, Roberto Tuchman, Carey Matsuba, and colleagues who generously gave of their time to advise: Ailsa McLellan Paul Eunson, Kaseem Ajilogba, Lynne Bremner, Ruth Henderson, Dawn Lamerton and the families who generously granted permission for their imaging to be included.
MICHAEL JOHNSTON
I would like to acknowledge Andrea Poretti, MD a Pediatric neurologist and expert on the cerebellum who very unfortunately passed away before the book was published. Andrea was from Switzerland worked with us at Hopkins and Kennedy Krieger and mentored by Prof Thierry Huisman.
ROBERT OUVRIER
Apart from my co-authors, Manoj Menezes, Paddy Grattan-Smith, Elsdon Story, and RusseIl Dale, I gratefully acknowledge all those who gave advice, case histories or illustrations: Eugen Boltshauser, Philip Britton, Chris Burke, Stephane Mathis, Shekeeb Mohammad, Michael Stevens, Chris Troedson, Jean-Michel Vallat, and Eppie Yiu.
Authors
CHAPTER 1
We acknowledge the help of the late Dr Andrea Poretti with this chapter.
CHAPTER 4
All new figures were provided in this chapter by Professor Laurent Guibaud, Department of Foetal and Paediatric Imaging, HFME, University Hospitals of Lyon, France.
CHAPTER 5
The valuable help of Dr Nicolas Deconinck Head of the Neurology Department, Hôpital Universitaire des Enfants Reine Fabiola, Université Libre de Bruxelles (ULB) in Brussels, Belgium and Dr Catheline Vilain the Department of Genetics, Hôpital Erasme, Université libre de Bruxelles in Brussels, Belgium are acknowledged.
CHAPTER 9
The invaluable assistance of Prof Jaume Campistol Plana, Head of the Child Neurology Department of Hospital San Juan de Déu (Barcelona, Spain) in reviewing this chapter and the foundational work done by Hélène Ogier on this topic in the previous editions of this book are acknowledged.
CHAPTER 10
We thank Professor Eugen Boltshauser, Professor emeritus Department of Pediatric Neurology, University Children’s Hospital, Zürich, Switzerland; Dr Eppie Yiu Paediatric Neurologist, NHMRC Early Career Fellow at the Department of Neurology, Royal Children’s Hospital Melbourne, Australia; and Professor Elsdon Storey, Professor of Neuroscience, Department of Medicine, Central Clinical School, Monash University Melbourne Vic Australia 3004, for their invaluable contribution to this chapter.
CHAPTER 12
Our late friend and colleague Dr Andrea Poretti, former Director of Pediatric Neuroradiology research at Johns Hopkins, and attending pediatric neurologist at Kennedy Krieger Children’s Hospital prepared several figures for this chapter.
CHAPTER 16
We acknowledge the medical and paramedical team at the Paediatric Clinical Epileptology, Sleep Disorders and Functional Neurology Department and of the Child Neurology Department at the University Hospitals of Lyon, France and the valuable help of our PA Mrs Sophie Naous.
CHAPTER 26
We thank Dr Anna Sarkozy, Dr Adnan Manzur, Dr Pinki Munot and Dr Stephanie Robb for the clinical activities in the Dubowitz Neuromuscular Centre.
CHAPTER 27
I acknowledge the assistance of Dr Dan Connolly, Neuro-Radiologist, Sheffield Children’s Hospital who helped select and describe the MRs used in the chapter. I am grateful to the following colleagues at Sheffield Children’s Hospital who reviewed the respective sections: Dr Sally Connolly, Paediatric Gastroenterologist/Hepatologist; Professor Paul Dmitri, Paediatric Endocrinologist; Professor Heather Elphick, Respiratory Paediatrician; Dr Jeanette Payne, Paediatric Haematologist; Professor Ajay Vora, Paediatric Haematologist; and Dr Jenny Welch, Paediatric Haematologist.
PART I
Fetal and Neonatal Neurology
Chapter 1Fetal Neurology
Chapter 2Neurological Diseases in the Perinatal Period
CHAPTER
1
Fetal Neurology
Adré J du Plessis and Michael V Johnston
A Brief History of Fetal Neurology
Neuroembryology
Normal Neural Tube Development
Disorders of Neural Tube Development
Disorders of Primary and Secondary Neurulation
Dysraphism of the Entire Neural Tube
Dysraphism of the Anterior Neural Tube
Encephaloceles
Dysraphism of the Posterior (Spinal) Neural Tube
Open Spinal Dysraphism
Closed Spinal Dysraphism (CSD)
Normal Rhombencephalic Development
Disorders of Rhombencephalic Development
Dandy-Walker Malformation
Dandy-Walker Variant
Vermian Hypoplasia
Blake’s Pouch Cyst
Mega Cisterna Magna
Arachnoid Cysts
Cerebellar Hemispheric Malformations
Pontocerebellar Hypoplasias
Normal Prosencephalic Development
Prosencephalic Formation
Prosencephalic Cleavage
Midline Prosencephalic Development
Disorders of Prosencephalic Development
Disorders of Prosencephalic Cleavage
Disorders of Midline Prosencephalic Development
Agenesis/Dysgenesis of the Corpus Callosum
Developmental Anomalies of the Cavum Septi Pellucidi
Disorders of the Fetal Choroid Plexus and Ventricles
Ventriculomegaly
Disorders of the Choroid Plexus
Normal Cerebral Cortical Development
Neuronal Proliferation
Neuronal Migration
Cortical Organisation
Disorders of Cerebral Cortical Development
Developmental Disorders of Neuronal Proliferation
Microcephaly
Macrocephaly
Disorders of Neuronal Migration
Focal or Multifocal Neuronal Migration Defects
Diffuse Neuronal Migration Disorders
Lissencephaly Type 1
Lissencephaly Type 2
Walker–Warburg Syndrome
Fukuyama Disease
Muscle-Eye-Brain Disease
Disorders of Cortical Organisation
Functional Development of the Fetal Brain
Electrochemical Development
Cerebral Energetic and Vasoregulatory Development
Development of Fetal Movements and Behaviour
Placental Function
Acquired Environmental Influences on the Fetal Brain
Fetal Brain Insults of Maternal Origin
Exogenous Maternal Insults
Fetal Infections
Zika Virus Associated Microcephaly
Fetal Brain Insults of Placental Origin
Fetal Brain Insults of Fetal Origin
The Intrapartum Period
Cellular Mechanisms of Intrapartum Hypoxic–Ischaemic Cerebral Injury
Fetal Neurodiagnostic Techniques
Prenatal Screening Tests
Prenatal Genetic Testing
Fetal Neuroimaging
Fetal Ultrasound Imaging
Fetal Brain MRI
Non-Invasive Techniques for Monitoring Fetal Hypoxemia and Acidosis
The Fetal Neurological Examination – a Work in Progress
CHAPTER
1
Fetal Neurology
Adré J du Plessis and Michael V Johnston
A BRIEF HISTORY OF FETAL NEUROLOGY
The earliest studies of fetal neurological function were focused on fetal motor activity, based on the observation of aborted human fetuses. In 1837, Erbkam published the first descriptions of ‘fetal’ movements from his direct observations of spontaneous miscarriages (Erbkam 1837). In the 1930s a Pittsburgh anatomist Davenport Hooker studied and filmed the activity of human fetuses from clinically indicated surgical abortions (Wilson 2014). The rapid development of fetal neurology in recent years has been driven by three major forces. The first major advance in fetal imaging, starting in the 1970s, provided the original real-time observation of the fetal morphology with 2D-ultrasound. The ability to view the fetus enabled the study of in utero fetal behaviour which in turn generated a school of mainly European investigators, led by the Austrian neuroscientist, Heinz Prechtl and his team (de Vries et al. 1982; Prechtl 1985). These investigators compiled a detailed developmental description of the emergence and evolution of fetal movements and began to apply their observations as a tool to assess the integrity of the developing nervous system. The second major stimulus for the nascent field of fetal neurology has been the advance in our understanding of neurology of the preterm newborn infant (‘ex utero fetus’) over the past 40 years. Finally, there has been a growing recognition that many of the major chronic diseases of childhood and adults have their origins in fetal life (Ravelli et al. 1998; Roseboom et al. 1999; Hales and Barker 2001) including neurological and psychiatric conditions such as attention deficit disorder, autism and schizophrenia (Geddes et al. 1999; Walker et al. 2015). In addition, the role of earlier fetal compromise in predisposing to catastrophic perinatal brain injury is now generally accepted and has focused studies onto the intrauterine support of fetal brain development.
Ongoing advances in the speed and resolution of fetal imaging continue to advance our understanding of the fetus and associated milieu. As the speed and structural resolution of fetal neuroimaging becomes increasingly sophisticated, so the diagnostic and prognostic expectations of the neurologist grow. Firstly, the increased structural resolution of particularly fetal MRI now detects smaller anatomic changes that require careful distinction from normal variation; this in turn demands an in-depth understanding of normal fetal brain development. Hereafter, an aetiological diagnosis is pursued, often with limited additional fetal neurodiagnostic tools. Particularly pressing issues include the neurodevelopmental prognosis and likelihood of recurrence in future pregnancies. Determining whether the neurological risks are likely to be progressive during and after gestation, as well as how the fetal brain will tolerate the hazards of labour and delivery, need to be considered. Based on the imaged phenotype additional diagnostic testing for genetic or environmental causes may be indicated. Gathering all available diagnostic information in a timely manner is particularly critical in situations where termination of pregnancy is an option. There may considerable pressure on the neurologist in situations where the outcome of the pregnancy may depend on their prognostic opinions. In addition, given the inevitable maternal stress triggered by an unknown fetal diagnosis, as well as the known adverse effects of maternal stress on the fetus, there is frequent pressure on the neurologist to formulate an opinion with limited data and without the benefit of a conventional physical examination of the fetus. If the pregnancy continues the neurologist should provide brain-oriented recommendations for the planning of labour, delivery and the transitional period, with the goal of minimising the risk of secondary brain injury.
The basic expertise needed by a fetal neurologist includes an in-depth understanding of structural and functional neuroembryology, the available neurodiagnostic tools and a first-hand experience of the long-term neurodevelopmental outcomes of the common fetal phenotypes. Although the field is still largely driven by dysmorphology it is inevitable that expertise around the environmental threats to the developing fetal brain will become essential with increasingly sophisticated fetal testing. This will require an understanding of the normal and pathological intrauterine milieu, basic principles of obstetrics, transitional physiology and pathophysiology, as well as the potential brain hazards confronting the fetus and newborn infant with congenital anomalies. In addition, counseling requires an understanding of the legal, cultural, religious and ethical considerations for each individual.
Currently, the practice of fetal neurology remains heavily influenced by standard obstetric protocols for fetal imaging, which vary across different regions. Specifically, most – but not all – fetal neurological concerns arise during the standard ‘anatomy screening’ fetal ultrasound around mid-gestation. As such the majority of consultations are for suspected neurological anomalies on these screening studies and are therefore lesion driven. The future role of the neurologist in fetal care is likely to involve a more active role in the brain-oriented care of high-risk populations, such as the fetus with growth restriction, birth defects and complicated twin pregnancies. The clinical discussions in this section will be confined to those most commonly seen in fetal neurology consultation and the territory covered is by no means exhaustive: many of the diagnoses more commonly made during postnatal period are discussed elsewhere in this book. The focus will be on conditions currently detectable in the fetal period rather than those diagnosed at birth or early infancy and are of presumed fetal origin.
NEUROEMBRYOLOGY
NORMAL NEURAL TUBE DEVELOPMENT
Development of the human nervous system starts on day 15 post-conception (p/c) when a primitive streak of specialised neuroectoderm forms on the dorsal surface of the embryo. Hensen’s node is a small nodule at the rostral end of the neural plate which directs development of the anterior neural tube. Dorsal induction is responsible for the formation and closure of the neural tube as well as the three primary vesicles at the rostral end of the neural tube. Ventral induction leads to formation of the cerebral hemispheres, eye vesicles, olfactory bulbs, pituitary glands and part of the face while dorsal induction includes primary and secondary neurulation. Primary neurulation begins with formation of the neural plate and tube, ending when the neural tube is separated from the surface ectoderm by the intervening mesenchyme. Formation of the neural plate starts on day 17 p/c and is complete by day 18 p/c when the edges of the neural plate begin to elevate, folding over to form the neural tube (Fig. 1.1). The entire process of primary neurulation is under the inductive influence of the notochord and chordal mesoderm underlying the neural plate/tube. Closure of the neural tube starts on day 20 p/c at the level of the future rhombencephalon. The anterior neuropore at the rostral end of the neural tube closes by day 25 p/c and the posterior neuropore on day 28 p/c at the upper sacral level. In the process of neural tube closure several important events occur: understanding both the normal and disturbed evolution of these developmental events is essential for informed evaluation and counseling of these cases. First, the neural tube becomes separated from the cutaneous ectoderm (disjunction) which then closes over the midline. The neural tube then becomes encircled by the mesenchyme which is interposed between the neural tube and dermal ectoderm. Exposure to the external surface of the neural tube induces the mesenchyme to develop into the vertebral column, meninges and muscle. When the neural tube fails to close exposure to the internal ependymal surface of the open central canal induces the mesenchyme to differentiate into fatty tissue, a process thought to be responsible for the association between neural tube defects and lipomatous lesions. Finally with closure of the neural tube neural crest cells are formed that come to lie on the dorsolateral aspects of the neural tube, where they develop into the dorsal root ganglia, cranial sensory and autonomic ganglia, as well as other tissues. Disturbances in disjunction, either premature disjunction or failure of disjunction, underlie many of the congenital spinal lesions seen in clinical practice.
Figure 1.1Development of the neural tube and neural crest. Fig. 1.1a shows the action of dorsalising signals from the ectoderm (e.g. bone morphogenetic proteins; BMP) and ventralising signals (e.g. sonic hedgehog, SHH) from the notochord on the developing neural plate. Fig. 1.1b shows folding of the edges of the neural plate to form the neural tube. Fig. 1.1c shows covering by the mesoderm and ectoderm over the closed neural tube, and separation of the neural crest tissues. The neural tube divided by the sulcus limitans into the dorsal alar and roof plates, and the ventral basal and floor plates. (Adapted from Ten Donkelaar, et al. Clinical Neuroembryology, 2nd edition, Springer 2014.)
Closure of the posterior neuropore marks the start of secondary neurulation at the caudal eminence. Secondary neurulation occurs in weeks 5 and 6 p/c, forming the sacrococcygeal elements caudal to the closed posterior neuropore and proceeds without direct involvement of the neural plate and tube. As the embryo approaches 30 days p/c this caudal eminence undergoes canalisation with cyst formation and coalescence, ultimately forming the filum terminale and distal conus medullaris. Ventral induction, which extends from 4 to 20 weeks p/c, includes a number of major developmental events. From 4 to 6 weeks p/c, following closure of the anterior neuropore, a series of constrictions form three anterior neural tube vesicles (prosencephalon, mesencephalon and rhombencephalon) (Fig. 1.2). Hereafter, three major flexures, the mesencephalic, pontine and cervical flexures, form in the anterior neural tube.