Childhood disintegrative disorder is also known as or subsumes Dementia infantalis, Disintegrative psychosis of childhood, and Childhood onset pervasive developmental disorder. -ed.
Childhood disintegrative disorder is a rare condition that mimics autism but develops after 2 years of age. The ICD-9, ICD-10, and DSM-IV definitions are essentially the same and include apparent normal development up to the age of at least 2 years followed by very marked loss of age-appropriate verbal and nonverbal communication, social relationships, play, and adaptive behavior. Under the proposed revisions to the upcoming DSM-V, the diagnosis of childhood disintegrative disorder will be removed and patients will instead be classified under autism spectrum disorder.