Metastatic tumours in the testis.

In a prospective autopsy study of male subjects with solic malignant neoplasms, six were shown to have metastatic deposits within the testis (2.5%). These were metastases from carcinoma of the prostate (two cases), melanoma (two cases), bronchial carcinoma (one case) and pleural mesothelioma (one case). In addition, four of 29 leukaemic patients and six of 28 with non-Hodgkin's lymphoma showed testicular involvement. The metastases from the solid tumours presented in solitary nodules, as multiple nodules or as a diffuse involvement. Microscopically, these were represented by tumour cells within the interstitial tissue without involvement of the seminiferous tubules; interstitial tissue and tubular involvement, and tumour confined to the seminiferous tubules respectively.