
Disintegrative psychosis; Heller syndrome
Childhood disintegrative disorder is a condition occurring in 3- and 4-year-olds who have developed normally to age 2. Over several months, a child with this disorder will deteriorate in intellectual, social, and language functioning from previously normal behavior.
The cause of childhood disintegrative disorder is unknown, but it has been linked to neurological problems. An affected child shows a loss of communication skills, has regression in nonverbal behaviors, and significant loss of previously acquired skills. The condition is similar to autistic disorder (autism).