[Giant plasmacytoma of the skull which appeared in the clinical course of multiple myeloma--a case report].

A 51-year-old woman with large plasmacytoma occurring from the temporal bone is presented. She has a history of multiple myeloma for 9 years. She manifested marked swelling in the left temporal area with tenderness. Neurological examination revealed no abnormality. She showed monoclonal free light chain (lambda type) in the serum and urine, and had multiple osteolytic lesions in her general bones. T1 WI of MRI exhibited a huge mass showing slightly high intensity in the left middle fossa and infratemporal fossa, and a part of the mass protruded into the extracranial space. The mass was markedly enhanced by Gd-DTPA. Angiography showed a hypervascular mass supplied by the external carotid artery. Biopsy disclosed plasmacytoma. She underwent local irradiation of 30 Gy and chemotherapy of Ranimustine (100 mg) and Cyclophosphamide (400 mg). The tumor reduced its size, and tenderness in her temporal area disappeared.