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Asperger Disorder
Asperger disorder, sometimes referred to as Asperger syndrome, is a neurobiological disorder. In contrast to autistic disorder, individuals with Asperger disorder do not have a delay in spoken language development. However, they can have serious deficits in social and communication skills. They often have obsessive, repetitive routines and preoccupations with a particular subject matter.

Pervasive Developmental Disorder Not Otherwise Specified (PDD/NOS)
PDD/NOS is a diagnosis often considered for children who show some signs of autistic disorder, but who do not meet the specific diagnostic criteria for the other PDDs.

Rett Disorder
Rett disorder is a complex neurological disorder that affects mainly girls, but there are reports of males who this disorder. Rett disorder is genetic in origin, and is among the most common genetic cause of profound intellectual and physical disability in girls, occurring more commonly than 1 in 10,000 female births. Individuals with Rett disorder develop normally until 6 to 18 months of age followed by a developmental regression. This regression is followed by a deceleration of head growth, loss of purposeful hand movements and followed by the appearance of midline, stereotypic hand movements. A gene associated with Rett disorder was identified in 1999.

Childhood Disintegrative Disorder
Children with childhood disintegrative disorder develop normally for a relatively prolonged period (usually 2 to 4 years) before developing a condition that resembles autistic disorder. Typically language, interest in the social environment, and often toileting and self-care abilities are lost, and there may be a general loss of interest in the environment.