Wiktionary
n. (context psychology English) A rare condition characterized by deterioration of language, social function, and motor skills in a child after normal development for the child's first three years.
Wikipedia
The childhood disintegrative disorder (CDD), also known as Heller's syndrome and disintegrative psychosis, is a rare condition characterized by late onset of developmental delays—or stunning reversals—in language, social function, and motor skills. Researchers have not been successful in finding a cause for the disorder. CDD has some similarity to autism, and is sometimes considered a low-functioning form of it. In May 2013, the term CDD, along with other types of autism, has been fused into a single diagnostic term called " autism spectrum disorder" under the new DSM-5 manual. Therefore, CDD is now also called " regressive autism", being that this term can now refer to any type of autism spectrum disorder that involves regression, including CDD.
CDD was originally described by Austrian educator Theodor Heller (1869–1938) in 1908, 35 years before Leo Kanner and Hans Asperger described autism. Heller had previously used the name dementia infantilis for the syndrome.
An apparent period of fairly normal development is often noted before a regression in skills or a series of regressions in skills. The age at which this regression can occur varies, but typically after 3 years of normal development. The regression can be so dramatic that the child may be aware of it, and may in its beginning even ask, vocally, what is happening to her/him. Some children describe or appear to be reacting to hallucinations, but the most obvious symptom is that skills apparently attained are lost.
Many children are already somewhat delayed when the disorder becomes apparent, but these delays are not always obvious in young children. This has been described by many writers as a devastating condition, affecting both the family and the individual's future. As is the case with all pervasive developmental disorder categories, there is considerable controversy about the right treatment for CDD.
Usage examples of "childhood disintegrative disorder".
I mean, something even more horrible than the usual things that occur to me, like that Rocky might be suffering from childhood disintegrative disorder, or that the mole on my right hip is growing and could turn into a two-hundred-pound tumor like the one that grew on that lady I saw on that documentary on the Discovery Health Channel called 200 Pound Tumor .