Testicular plasmacytomas occurring as primary solitary lesions are exceedingly rare and make up less than 0.1% of all testicular tumors. They are more commonly seen as secondary tumors in patients with generalized multiple myeloma. This specimen is an example of solitary plasmacytoma of the testis. Grossly, the tumor cannot be distinguished from a lymphoma or a germ cell tumor like seminoma. The diagnosis was confirmed with morphology and with immunohistochemical stains.