Classification of tumors of testis.

In adult patients, testicular tumors consist predominantly of seminoma, embryonal carcinoma, teratoma, choriocarcinoma and mixtures of these. In infants and children, yolk sac tumor and teratoma are the usual tumors; in older age patients, it is predominantly spermatocytic seminoma and malignant lymphoma, although the others may occur as well. Leydig and Sertoli-granulosa cell tumors occur in all ages. The introduction of tumor markers and the capability to demonstrate these in tissue are the most important recent developments. However, there is great need for correlation of histology with these markers and histological demonstration of them.