Specialists generally recommend hormone therapy to ensure optimal sexual development in such cases - including growth of pubic and facial hair, increased size of the penis and scrotum, deepening of the voice, and increased muscular size and strength. This treatment, however, does not repair the sperm production problems. XYY Syndrome XYY syndrome has more a variable physical expression than other genetic abnormalities. Indeed, no consistent syndrome has yet been defined, since XYY men may suffer from abnormalities like seminiferous tubule sclerosis, or they may present with normal gonads. In general, though, men with XYY syndrome are extremely tall, and they may suffer from a pustular form of acne.
Some individuals express antisocial behavior.
If a patient with mixed gonadal dysgenesis has been reared as a male and has a normally descended testicle, then he may be fertile. Men with Noonan syndrome usually are infertile due to cryptorchidism and insufficient sperm production. Cardiovascular abnormalities also may be present. Kallmann's syndrome Please see Endocrine Disorders to learn more about Kallmann's syndrome. An inherited disorder that is characterized by delayed muscle relaxation after initial contraction.