Abstract
The introduction of intracytoplasmic sperm injection (ICSI) into the catalogue of assisted reproductive technologies in the mid-nineties has, for the first time, offered men who suffer from severe disorders of spermatogenesis and azoospermia the possibility of fathering a child. Different surgical techniques can be used to extract spermatozoa from these men from either the epididymis and/or the testis for ICSI. Surgical sperm retrieval offers a treatment for both patients with testicular or obstructive azoospermia in cases where microsurgical refertilization is not an option or has already failed. Among surgical techniques that have been developed over the years, microsurgical epididymial sperm aspiration (MESA) and testicular sperm extraction (TESE) have become the most popular. By utilizing these techniques together with the cryopreservation of extracted spermatozoa, a single surgical intervention is able to provide spermatozoa for several ICSI attempts.
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