Abstract
The incidence of mononuclear cell (MNC) infiltrates was studied in the testes of the following: 45 patients with carcinoma in situ (CIS) as the only lesion in the testis, CIS accompanied by an early invasion of CIS or CIS accompanied by invasive germ cell tumour (GCT) of the testis; 100 men and 146 boys who had died suddenly and unexpectedly, and 100 infertility patients. The results suggest that (1) the incidence of MNC infiltration increases with increasing severity of testicular malignant changes, (2) increased MNC infiltration is also evident in the contralateral testis where no malignant cells can be observed, (3) the incidence of MNC infiltration in men who died suddenly is not different from that in men who have had their testes biopsied because of infertility, and (4) the incidence of MNC infiltration is high in testes of boys younger than 1 year of age.
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