Psychiatric disturbances in a 6-year-old boy with Klinefelter's syndrome.

A 6-year-old boy with severe psychiatric problems was found to have Klinefelter's syndrome. He had a mixed emotional and behavioral clinical picture similar to and difficult to distinguish from that of other child psychiatric disorders. Klinefelter's syndrome should be considered in the differential diagnosis of a prepubertal boy with multiple emotional, behavioral, academic, social, and developmental problems.