Plasmacytoma of the hard palate.

Multiple myeloma is a systemic malignant disease and is associated with a poor prognosis. It is characterized by neoplastic proliferation of plasma cells involved in the production and secretion of monoclonal immunoglobulins (M proteins). It is generally a disseminated disease involving many bones. Systemic symptoms include bone pain, pathologic fracture, renal failure, hypercalcemia, weight loss, anemia, thrombocytopenia, and neutropenia. This condition may occur as a solitary lesion (solitary plasmacytoma), which in some patients eventually progresses to plasma cell myeloma. Extramedullary plasmacytoma is defined as neoplastic proliferation of plasma cells in the soft tissue. It usually occurs in the upper respiratory tract, such as the nasal cavity or posterior oropharynx. The authors present a rare plasmacytoma case with maxilla involvement.