A 47,XXq-Y Klinefelter male.

Case Report The patient was first seen by one of us (G.N.R.) when he was in St Martha's Hospital being treated for viral hepatitis. He is a dull-looking boy with a rather large build for his age. The lower jaw is prominent, the hands are large, and there is gynaecomastia on both sides. He also shows sinus bradycardia. Body hair has a feminine distribution. The testes are small and soft and a biopsy showed atrophy of the seminiferous tubules. He is the 3rd of 5 children. His mother, two older sisters, and a younger brother and younger sister are apparently normal. His father is no longer alive.