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The first three of these disorders are commonly called the autism spectrum disorders; the last two disorders are much rarer, and are sometimes placed in the autism spectrum and sometimes not. [2] [3] In May 2013, the Diagnostic and Statistical Manual–5th Edition (DSM-5) was released, updating the classification for pervasive developmental ...
PDD-NOS was one of four disorders collapsed into the diagnosis of autism spectrum disorder in the DSM-5, [3] and also was one of the five disorders classified as a pervasive developmental disorder (PDD) in the DSM-IV. [4] The ICD-10 equivalents also became part of its definition of autism spectrum disorder, as of the ICD-11.
People with Asperger syndrome often display restricted or specialized interests, such as this boy's interest in stacking cans. As a pervasive developmental disorder, Asperger syndrome is distinguished by a pattern of symptoms rather than a single symptom.
Before the DSM-5 (2013) and ICD-11 CDDR (2024) [45] diagnostic manuals were adopted, ASD was found under the diagnostic category pervasive developmental disorder. The previous system relied on a set of closely related and overlapping diagnoses such as Asperger syndrome and the syndrome formerly known as Kanner syndrome.
People with developmental disabilities (particularly autistic spectrum disorders) can exhibit challenging behavior, defined as "culturally abnormal behaviours of such intensity, frequency or duration that the physical safety of the person or others is placed in serious jeopardy, or behaviour which is likely to seriously limit or deny access to ...
CDD is a rare condition, with only 1.7 cases per 100,000. [13] [14] [15]A child affected with childhood disintegrative disorder shows normal development. Up until this point, the child has developed normally in the areas of language skills, social skills, comprehension skills, and has maintained those skills for about two years.
Furthermore, the presence of autism can make it harder to diagnose coexisting psychiatric disorders such as depression. [9] Diagnosing will be much harder in adults, since most people with ASD who reach adulthood undiagnosed, learn diverse (and often intense) masking techniques which make external diagnosis almost impossible.
It was originally suggested to be a subtype of pervasive developmental disorders (PDD) with co-morbid schizophrenia or another psychotic disorder; however, there is some controversy that not everyone with MCDD meets criteria for both PDD and psychosis. The term multiplex developmental disorder was coined by Donald J. Cohen [1] in 1986.