Plasma cell granuloma of the lung--resection and steroid therapy.

We report on three resected cases of intrapulmonary plasma cell granuloma. All of them were asymptomatic. One of them showed bilateral multiple lesions and in this case bilateral partial resections of lung in one stage were performed. Under light and electron microscopy the lesions were composed of plasma cells and other kinds of inflammatory cell. The plasma cells were mature and had rich endoplasmic reticulum but no kind of intracytoplasmic inclusion. Steroid therapy was effective for the recurrent lesion after the operation.