Suspected to schizophrenia with disorganized behavior in autistic child

Initially: Initially it was thought that the disorder of childhood autism and childhood schizophrenia، in fact، are same conditions however، subsequent studies revealed differences. To differentiate autistic disorder from schizophrenia, longitudinal studies are needed. Psychosis in patients with a diagnosis of autism is still challenging, because these two disorders have similar characteristics; including disturbances in perception, thought disorders, cathatonia and impaired reality testing. Other differential diagnosis of psychosis in childhood include: Psychosis due to organic illness, substance abuse, childhood disintegrative disorder، Asperger disorder, psychotic depression. The following report discusses the difficulty in differentiatin gautism disorder from other causes of disorganized behavior anddescribes its importance in treatment.