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.
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.