Microscopic epididymal sperm aspiration (MESA)
is a technique used for the retrieval of sperm for males experiencing
azoospermia, or an absence of living sperm in their semen. This condition is
common in men with a blocked or no vas deferens, a testicular duct that carries
sperm to the penis. It may also be indicated for men who have had a
vasectomy.
This procedure is performed by urological specialists trained in the field of
male infertility. Often, one retrieval yields enough sperm to have some
cryopreserved. Your physician will discuss any minor risks of the procedure with
you in detail.