[Extramedullary plasmacytoma and hypercalcemia]

Extramedullary plasmocytoma (EMP) is an infrequent entity characterized by the proliferation of malignant plasma cells which are generally found on the mucosa of the upper respiratory tract. A case of EMP located in the right maxillary sinus is referred. Peculiarities of the same were resistance to radiotherapy with local relapse and severe hyperkalemia. Despite deliberate searching, disease dissemination could not be demonstrated.