Tumor of the testis: an attempt of histological classification according to WHO guide line.

MUKADA, T., ANDOR, N. and SASANO, N. Tumor of the Testis: An Attempt of Histological Classification According to WHO Guide Line. Tohoku J. exp. Med., 1981, 134 (4), 367-373 Testicular tumor in Japan is one of the evil neoplasms which have increased in incidence rate in recent years. In order to provide the basic data for the clinicopathological and epidemiological studies on testicular tumors, the WHO histological classification was applied to 86 cases in the file of Department of Pathology, Tohoku University School of Medicine, in the years of 1969 through 1980. Of 86 cases, 75 (87%) were germ cell tumors including 37 seminomas, 10 yolk sac tumors, 4 embryonal carcinomas, 9 mature teratomas, and 15 combined forms. The combined forms consisted mainly of embryonal carcinoma and immature teratoma. Malignant lymphoma was encountered in 8 cases. These malignant tumors showed characteristic age preponderance. Nongerm cell benign tumors were recorded in only 3 cases. Briefly mentioned were some histological diagnostic hallmarks of malignant testicular tumors. epidemiology neoplasm; testis