The histological classification recommended devides all testicular biopsy of sterile male into five categories (1) normal mature testis ; (2) germ cell aplasia ; (3) germinal hypoplasia ; (4) spermatogenic arrest and (5) fibrosis of the tubulus. Each histological pattern encountered 9.4%, 49.5%, 21.5%, 12.1% and 7.5% respectively. Relation between testicular histology and some cau s ative conditions, for example, febrile diseases, mumps and etc., is represented in the Table 4 and 5. Obstruction of the seminal tract was detected only in 9 cases (8.4%), of which gonorreal occulsion had never seen in my study. As destructive effect of radioactive agents, atomic bombing casualty at Hiroshima were also described. Comparative resea r ch of the histology and spermatic analysis is tabulated in the Table 6 and 7. Germ cell aplasia was discovered in 64% of the cases with azoospermia, and this percentage is relatively higher than many previous literature. It is concluded that testicular biopsy has proven to be a valuable diagnostic measure in the management of sterile male
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