Alloplastic spermatocele in cases of vasa aplasia.

Alloplastic spermatocele implants were used for 11 infertile men with bilateral congenital absent vas. Successful recovery of spermatozoa from the prosthesis was obtained in 8 cases for periods up to 4 months after the operation. Single aspirations showed 200,000 to 30 million spermatozoa, and the aspirated volume varied between 0.4 and 1.0 ml. Artificial insemination of the wife was done at the time of ovulation, but no pregnancy has been achieved yet. In only 3 cases the aspirated fluid did not show spermatozoa, which might be due to occlusion of the vasa efferentia or ductus epididymis.