This PPT provides a brief overview of the five Pervasive Developmental Disorders: Autism, Asperger’s Syndrome, Childhood Disintegrative Disorder, PDD-NOS, and Rett’s Disorder. It explains their symptoms, developmental patterns, and how most are now categorized under Autism Spectrum Disorder (ASD). The presentation also touches on current treatment limitations and highlights stem cell therapy as a potential future approach for managing autism.