A case of IgG-κ-producing Extramedullary

Abstract

A 32-year-old woman was admitted to our hospital because of throat pain and slight fever. On examination, she was found to have a tumor in the left tonsil. Histological examination showed the lesion to be a plasmacytoma. Monoclonal IgG-k was detected in the tumor tissue. There was no evidence of tumor else-where. The tumor was diagnosed as extramedullary plasmacytoma of the tonsil, and removed. Surface marker analysis of the tissue, using monoclonal antibody, demonstrated 64.3%OKIa-1,64.5% B-1,33.9% OKT-3,25.8% OKT-4 and 16.6% OKT-8. This showed the tumor cells had B-cell surface markers, suggesting that the tumor was the result of plasmacytoid cell proliferation.