Klinefelter Syndrome (KS) is a chromosomal condition that affects males and causes hypogonadism and infertility. It is the cause of infertility in 10% of the cases of azoospermia, although presence of a reduced number of sperms has been found in some cases.
The physical traits (phenotype) of males affected by KS are:
- Small testicles
- Poor muscle development
- Too long legs and short trunk
- Sparse or absent facial and body hair