[Comparison of the efficacy of ICSI using either spermatozoa aspired microsurgically from the epididymis (MESA-ICSI) or obtained from the ejaculation].

Objective: Microsurgical epididymal sperm aspiration and intracytoplasmic sperm injection (MESA-ICSI) is a viable alternative to the treatment of couple sterility caused by obstructive azoospermia. Because there are structural differences between epididymal and ejaculated spermatozoa and it is not univocally stated, if this fact influences positively or negatively the results of ICSI, it was decided to compare the efficacies of ICSI using both the kinds of spermatozoa at the same setting.

Design: Retrospective comparative analysis.