Klinefelter syndrome

A sex chromosome disorder caused by the presence of an extra X chromosome in the male karyotype. Affected individuals are infertile and have a small penis and testes. They tend to have tall stature and long legs and may have difficulties with speech and language development. Gynecomastia may be present.

Also known as: 47,XXY syndrome, Klinefelter syndrome, Klinefelter's syndrome, Klinefelter's syndrome, XXY, XXY syndrome, XXY syndrome (Klinefelter syndrome), hypogonadotropic hypogonadism

17 clinical trials for this condition and its sub-types, 9 tagged with Klinefelter syndrome itself.