Childhood disintegrative disorder

Childhood disintegrative disorder (CDD), also known as Heller syndrome or disintegrative psychosis, is a rare neurodevelopmental condition classified among the pervasive developmental disorders. It is characterized by a period of apparently normal development for at least the first two years of life, followed by a significant and dramatic loss of previously acquired skills in at least two of the following areas: expressive or receptive language, social skills or adaptive behavior, bowel or bladder control, play, and motor skills. This regression typically occurs between ages 2 and 10, most commonly between ages 3 and 4. The disorder primarily affects the central nervous system, leading to profound impairments in social interaction, communication, and behavior that closely resemble autism spectrum disorder but are distinguished by the late onset and severity of regression. Children with CDD often develop restricted, repetitive patterns of behavior, interests, and activities. Many affected children also experience seizures, and some may show abnormalities on electroencephalography (EEG). Intellectual disability is common and often severe following the regression period. The loss of skills is generally permanent, and most individuals require lifelong support. The underlying cause of childhood disintegrative disorder remains largely unknown in most cases, though some cases have been associated with identifiable neurological conditions such as lipid storage diseases, subacute sclerosing panencephalitis, or other neurometabolic disorders. No specific genetic mutation has been consistently identified. There is no cure for CDD, and treatment is primarily supportive and symptomatic, similar to approaches used in autism spectrum disorder. This includes behavioral therapy, speech and language therapy, occupational therapy, social skills training, and pharmacological management of associated symptoms such as seizures, anxiety, or behavioral disturbances. Early intervention and structured educational programs may help maximize remaining abilities.

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