A Case of Synchronous Multiple Primary Malignancies Involving Multiple Myeloma and Pharyngeal Plasmacytoma in an Elderly Male: A Case Report and Review of the Literature.

Monoclonal plasma cells form the solitary neoplasm known as solitary plasmacytoma. Isolated extramedullary plasmacytoma is less common than solitary bone plasmacytoma. An elderly male presented with coughing blood and was diagnosed with pharyngeal plasmacytoma with synchronous multiple myeloma. Herein, we present this challengingly rare case to increase awareness of this unusual entity.