
This disorder is named by Dr. Harry Klinefelter, who first reported its symptoms in 1942. Klinefelter syndrome does not decrease the longevity of males. Male with Klinefelter syndrom are sterile. Before puberty, there are no obvious symptoms, symptoms become clear until puberty. Half of patients with breast development was gynecomastia. Gynecomastia is a condition of overdevelopment of a male's breasts.

