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Up to: Sex chromosome disorder of sex development · Trisomy · Chromosome X disorder
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.
This condition has no sub-types.