"Childhood disintegrative disorder (CDD), or Heller's syndrome, is a rare pervasive developmental disorder (PDD) which involves regression of developmental ability in language, social function and motor skills. It is a devastating condition of unknown cause.
PDDs are a spectrum of behavioural problems associated with autism and autism-like syndromes. They include CDD, Rett's Syndrome and pervasive developmental disorder - not otherwise specified (PDD-NOS). CDD is considered a low-functioning form of autistic spectrum disorder. However, autism does not show the severe regression after several years of normal development which characterises CDD, and children with CDD show a more dramatic loss of skills compared with children with autism. CDD also tends to develop later than autism, and can develop very much later (up to the age of 10 years)."
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