A GROUP OF ADOLESCENT AND YOUNG ADULT HOSPITALIZED PSYCHIATRIC PATIENTS (10 MALES AND TWO FEMALES) PREVIOUSLY DIAGNOSED AS HAVING SCHIZOPHRENIC OR PERSONALITY DISORDERS WERE REDIAGNOSED AS HAVING CHRONIC BRAIN SYNDROME. DEVELOPMENTAL DEVIANCY, BEHAVIOR DISORDERS STARTING IN CHILDHOOD, AND PSYCHOLOGICAL TEST PERFORMANCES WERE COMPATIBLE WITH AN EARLY MINIMAL BRAIN DAMAGE SYNDROME. A SHORT REVIEW OF THE LITERATURE REGARDING EARLY MINIMAL BRAIN DAMAGE AND ADOLESCENT PSYCHIATRIC SYNDROMES IS PRESENTED, AS IS A CASE STUDY OF ONE OF THE SUBJECTS INVOLVED IN THE STUDY. THIS PAPER WAS PRESENTED AT THE AMERICAN ORTHOPSYCHIATRIC ASSOCIATION CONVENTION, WASHINGTON, D.C., MARCH, 1967. (SK)