Testicular biopsy of secretory azoospermia: electron and light microscopic analysis.

The histological and ultrastructural features of testicular cells were examined in testes with secretory azoospermia in seven patients with germinal cell arrest, two with Sertoli-cell-only; and one with tubular hyalinization. Germinal cell arrest was characterized by the presence of spermatogonia AD, AP, B, and some primary spermatocytes: these cells had similar ultrastructural features typical of the adult normal testis. Sertoli cells contained large number of various lipid inclusions and lipofuscin bodies. The multilayered peritubular wall presented increased collagen fibers. The cytoplasm of Leydig cells was filled with dilated vesicles of smooth endoplasmic reticulum and precursors of Reinke crystalloids. A blockage in the seminiferous tubules occurred after puberty, when tubular components, peritubular wall and Leydig cells had reached maturity.