PDD NOS

Pervasive Developmental Disorder - Not Otherwise Specified (PDD-NOS) is a pervasive developmental disorder (PDD)/autism spectrum disorder (ASD). PDD-NOS is one of three forms of Autism Spectrum Disorders. PDD-NOS is often referred to as atypical autism. It lies in between the less severe Asperger’s syndrome, and more severe, typical Autism on the Autism Spectrum.