Differential diagnosis of psychosis. A brief guide for the primary care physician.

By keeping in mind that not a psychosis is schizophrenia, the primary care physician can often avoid misdiagnosis in behaviorally disturbed patients. Abnormal behavior may result from mood disorders, drug-induced psychosis and other organic disorders, personality disorders, delusional disorders, autism, or mental retardation. A long-term history is essential for correct diagnosis and treatment.