Diseases of the Genitourinary System

Gynecomastia
is an abnormal enlargement of one or both breasts in men. It usually involves only the nipple area and nearby tissue of one breast, but in some cases the whole breast region may be enlarged to such a degree that it takes on the appearance of female breasts.

Klinefelter Syndrome
describes a group of symptoms found in some men with an extra X chromosome. Every man who exhibits symptoms of Klinefelter Syndrome has an extra X chromosome, but not every male who has the extra chromosome exhibits symptoms.