In the observation of 500 cases of craniocerebral injury evacuated to an army neurologic center several months after injury, 4 cases of psychosis appeared. These are described in detail.Two cases may be classified as schizophrenic reactions in which brain injury played a secondary rôle. At the most, the experience of, trauma, brain damage, and resulting state of deficit served as an aggravating factor. Follow-up study revealed neither patient able to pursue steady or gainful occupation.Two cases may be classified as prolonged, primary traumatic psychotic reactions (confabulatory-amnesic type) in which brain damage appeared to be the outstanding causative factor. Follow-up study revealed that both patients had been able to return to simple, but steady and gainful, occupational adjustments despite some intellectual impairment.