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The pervasive developmental disorders were: [4] Pervasive developmental disorder not otherwise specified (PDD-NOS), which includes atypical autism, and is the most common (47% of autism diagnoses); [10] Typical autism, the best-known; Asperger syndrome (9% of autism diagnoses); Rett syndrome; and; Childhood disintegrative disorder (CDD).
As for the other pervasive developmental disorders, the diagnosis of PDD-NOS required the involvement of a team of specialists. The individual needs to undergo a full diagnostic evaluation, including a thorough medical, social, adaptive, motor skills and communication history. [ 4 ]
Autism spectrum disorder [a] (ASD), or simply autism, is a neurodevelopmental disorder "characterized by persistent deficits in social communication and social interaction across multiple contexts" and "restricted, repetitive patterns of behavior, interests, or activities". [11]
Developmental disability is a diverse group of chronic conditions, comprising mental or physical impairments that arise before adulthood. Developmental disabilities cause individuals living with them many difficulties in certain areas of life, especially in "language, mobility, learning, self-help, and independent living". [1]
Childhood disintegrative disorder (CDD), also known as Heller syndrome and disintegrative psychosis, is a rare condition characterized by late onset of developmental delays—or severe and sudden reversals—in language (receptive and expressive), social engagement, bowel and bladder, play and motor skills.
Developmental disorders are present from early life onward. Most improve as the child grows older, but some entail impairments that continue throughout life. These disorders differ from Pervasive developmental disorders (PPD), which uniquely describe a group of five developmental diagnoses, one of which is autism spectrum disorders (ASD ...
About one in six children in the U.S. has at least one developmental disability or other developmental delay, according to the U.S. Centers for Disease Control and Prevention.
Infantile neuroaxonal dystrophy (INAD) is a rare pervasive developmental disorder that primarily affects the nervous system.Individuals with infantile neuroaxonal dystrophy typically do not have any symptoms at birth, but between the ages of about 6 and 18 months they begin to experience delays in acquiring new motor and intellectual skills, such as crawling or beginning to speak.