[A case of plasma cell granuloma which resolved after steroid treatment].

A 65-year-old man with a history of a common cold two months earlier was referred to our division for further evaluation of an abnormality on chest X-ray film. Transbronchial lung biopsy findings revealed an inflammatory pseudotumor, a plasma cell granuloma (PCG). The pulmonary nodule disappeared completely six weeks after steroid therapy. To our knowledge, all PCG cases to date have been surgically resected. Therefore, this case of PCG diagnosed by transbronchial lung biopsy and successfully treated nonsurgically with steroid therapy is worthy of note.