This patient had a history of multiple myeloma, treated with bone marrow transplant, and had been in remission for more than 12 months. The testes are a known site for hematological malignancies, including reports of plasmacytoma / multiple myeloma, due to the testicular blood barrier. Testicular plasmacytoma / multiple myeloma is rare, even in patients with known disease. There was no other evidence of disseminated myelomatous deposits.