XYY sex chromosomes in a Jamaican with orthopaedic abnormalities.

Abstract

Patients with a sex chromosome complement of XYY in whom the physical findings vary from apparent normal maleness, to genital anomalies, mental defect, and criminal tendencies have been described by several authors. The one common feature in the adult cases has been tallness. We here report an adult male with an XYY complement who, in addition to mental defect, hypogonadism, and increased height showed interesting orthopaedic abnormalities.