Synchronous presentation of a primary iliac lymph node plasmacytoma and a prostate adenocarcinoma.

Synchronous presentation of primary nodal plasmacytoma and prostate cancer is very rare and has not been described in the literature. Here, we report a case of a patient with nodal plasmacytoma whose clinical presentation was suggestive of metastatic prostate cancer in the setting of recently diagnosed prostate cancer. The workup and treatment of both malignancies as well as a possible underlying common pathologic mechanism (IL-6 gene mutation) are discussed.