In the last decade the term 'comorbidity' has gained popularity in the field of paediatric neurodisability, with the increasing recognition that many conditions are rarely present in isolation. Clinics in Developmental Medicine No. 187 In the last decade the term 'comorbidity' has gained popularity in the field of paediatric neurodisability, with the increasing recognition that many conditions are rarely present in isolation. FOREWORD Christopher Verity (Cambridge, UK) INTRODUCTION Martin Bax (London, UK) and Christopher Gillberg (Gothenburg, Sweden) 1. INTELLECTUAL DISABILITIES AND THEIR COMBORBIDITIES Jeremy Turk (London, UK)2. HETEROGENEITY IN CEREBRAL PALSY: VARIATIONS IN NEUROLOGY, COMORBIDITY AND ASSOCIATED CONDITIONS J. Keith Brown (Edinburgh, UK), Paul Eunson (Edinburgh, UK) and Martin Bax (London, UK)3. GILLES DE LA TOURETTE SYNDROME AND ITS COMMON COMORBIDITIES Michael Orth (Ulm, Germany) and Mary May Robertson (London, UK)4. COMORBIDITY IN NEURODEVELOPMENTAL DISORDERS: THE CASE OF ATTENTION-DEFICIT-HYPERACTIVITY DISORDER Eric Taylor (London, UK)5. EARLY LANGUAGE DISORDER AS A FREQUENT COMORBIDITY IN MANY DEVELOPMENTAL DISORDERS IN YOUNG CHILDREN Isabelle Rapin (Bronx, NY, USA)6. AUTISM AND EPILEPSY: COMORBIDITY, COEXISTENCE OR COINCIDENCE? Christopher Gillberg (Gothenburg, Sweden) and Brian Neville (London, UK)7. GENETIC CORRELATES OF PSYCHIATRIC COMORBIDITY: FRAGILE X SYNDROME Sufen Chiu, David Hessl, Josh Day and Randi Hagerman (Sacramento, CA, USA)8. CHANNELOPATHIES Sameer Zuberi (Glasgow, UK)9. INCREASED LONGEVITY AND THE COMORBIDITIES ASSOCIATED WITH INTELLECTUAL AND DEVELOPMENTAL DISABILITY Emma J. Glasson and Alan H. Bittles (Perth, Australia)10. COMORBIDITY: CLASSIFICATION ARTEFACT AND CLINICAL REALITY Rutger Jan van der Gaag (Nijmegen, The Netherlands)