A case of bronchial plasmacytoma occurring in a 57‐ year‐old housewife is reported. She had had the productive cough and the “abnormal shadow” in the right lower lobe for three years before admission. On bronchocopy, a tumor was found in the right main bronchus, large enough to obstruct the air way. The tumor was resected through rigid bronchoscope. Histological impression was “plasmacytoma with local amyloid deposit.” M‐protein was never detected in the serum or urine. Applying the immunoperoxidase technique for the paraffin section, the plasma cells were found to contain only a single type of immunoglobulin, Ig G‐L. The differential diagnosis between plasmacytoma and plasma cell granuloma was made, and plasmacytoma was considered to be one type of extranodal mal
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