A vasovasostomy , similar to an epididymovasostomy, can repair the obstruction. But usually obstruction of the vas deferens is deliberate , caused by a vasectomy. The best candidates for vasectomy reversals are those who had their vasectomy within the last 10 years. Orchitis Orchitis, inflammation of the testes, can be dangerous to an adult male's fertility because it can cause permanent, irreversible sterility. When orchitis occurs prior to puberty, a man's testicular function should not be affected.
Viral infections are usually the cause of orchitis, the most notorious of which are the mumps.
In this case, not only is the swelling of the testes dangerous, but the mumps virus also directly attacks the testes and can destroy their ability to make sperm. The amount of swelling, however, does not have bearing on the amount of sperm damage that occurs. In fact, some men can fully recover from the mumps and go on to father children, while others remain infertile. Testicular failure is easily diagnosed through a blood test, which will show high levels of FSH and LH, signs that the testes are failing. The mumps are certainly not the only disease that causes orchitis.