A procedure whereby immature sperm is aspirated from the epidydimis. This is done in cases where the man has had a vasectomy or in men who are born without the vas deferens (the duct that transports sperm from the epidydimis into the ejaculate). Sperm extracted this way can only fertilize the egg if the ICSI procedure is used.

MESA – Micro Epidydimal Sperm Aspiration