This category includes those disorders which develop immediately after severe head injury or brain surgery and the post-traumatic chronic brain disorders. It does not include permanent brain damage which produces only focal neurological changes without significant changes in sensorium and affect. Generally, trauma producing a chronic brain syndrome is diffuse and causes permanent brain damage. If not of psychotic proportions, a post-traumatic personality disorder associated with an organic brain syndrome is classified as a Non-psychotic OBS with brain trauma. If the brain injury occurs in early life and produces a developmental defect of intelligence, the condition is also diagnosed Mental retardation. A head injury may precipitate or accelerate the course of a chronic brain disease, especially cerebral arteriosclerosis. The differential diagnosis may be extremely difficult. If, before the injury, the patient had symptoms of circulatory disturbance, particularly arteriosclerosis, and now shows signs of arteriosclerosis, he should be classified Psychosis with cerebral arteriosclerosis.
As of DSM-III, this disorder is no longer part of the DSM.