Children who seem normal at first but who begin to show autistic behavior as they get older might be diagnosed with "childhood disintegrative disorder"
Childhood disintegrative disorder
Childhood disintegrative disorder is also called Heller's disease and most often develops between two and ten years of age. Children with CDD develop normally until two to three years of age and then begin to disintegrate rapidly.
Pervasive Developmental Disorders,or PDD, are a range of disorders in which young children display delays in skills, especially social skills. Autism falls into this category, as does Asperger's syndrome and Rett's syndrome.
PDD is an acronym for pervasive developmental disability, which is a description of a type of developmental disorder. It means the same as autism spectrum disorder. It encompasses five conditions: autism, Asperger's Syndrome, Rett Syndrome, childhood disintegrative disorder, and PDD-Not Otherwise Specified. See the related question below "What are autism spectrum disorders?" for more details.
Autism isn't a disease or a virus, thus there are no strains of autism. Autism is just autism, it was previously split up into Autism Spectrum Disorder (Classic Autism), Asperger Syndrome, Pervasive Developmental Disorder Not Otherwise Specified (PDD-NOS), childhood disintegrative disorder, and Rett Syndrome - now all are merged under the Autism Spectrum Disorder diagnosis.
Yes, an autism spectrum exists. It involves autistic disorder, asperger syndrome childhood disintegrative disorder, rett syndrome and persuasive developmental disorder; depending on the affected individual, he or she can display mild, severe or symptoms somewhere in between based on these categories. Behaviors displayed can vary from individual to individual and individual variations exist as well. Autistic disorder is the most severe form of autism and asperger sydrome is the mildest form.
DefinitionChildhood 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.Alternative NamesDisintegrative psychosis; Heller syndromeCauses, incidence, and risk factorsThe 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).SymptomsLoss of social skillsLoss of bowel and bladder controlLoss of expressive or receptive languageLoss of motor skillsLack of playFailure to develop peer relationshipsImpairment in nonverbal behaviorsDelay or lack of spoken languageInability to start or sustain a conversationSigns and testsThis disorder must be differentiated from both childhood schizophrenia and pervasive developmental disorder (autism).The most important signs of childhood disintegrative disorder are loss of developmental milestones. The child tends to have normal development through age 3 to 4, and then over a few months undergoes a gradual loss of previously established abilities (e.g., language, motor, or social skills). Generally, the diagnosis is made with a loss of functioning in at least two areas described above.TreatmentTreatment is the same for autistic disorder (autism) because of the similarity in the two disorders.Expectations (prognosis)Unfortunately, the prognosis for this disorder is limited. The loss of functioning will likely be permanent. However, to some degree, behaviors can be modified.Calling your health care providerCall your provider if your child has any delays in development or starts to lose developmental abilities.
There are many kinds of childhood disorders. Thus it would be hard to define them all.
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