Question: what is pervasive developmental disorder atypical autism?
Answer: Pervasive Developmental Disorder (Not Otherwise Specified) is a form of autism. It is also known as PDD(NOS) or atypical autism. PDD(NOS) is used to describe people who don't fit neatly into one of the specific kinds of autism, such as autistic disorder, Asperger syndrome or childhood disintegrative disorder.