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Pervasive Developmental Disorder Not Otherwise Specified (PDD-NOS)

Pervasive Developmental Disorder Not Otherwise Specified (PDD-NOS), also known as Atypical Autism, refers to all cases where there is severe and pervasive impairment in:

  • social interactions, or
  • verbal and nonverbal communication, or
  • stereotyped behaviors, interests and activities,

but diagnostic criteria are not met for an Autism Spectrum Disorder, Schizophrenia, Schizotypal Personality Disorder, or Avoidant Personality Disorder.

 

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Childhood Disintegrative Disorder

Mental Retardation