Abstract

A 34 -year-old man was admitted to the hospital because of chro­nic cough. Pulmonary radiogram showed a cavitary coin lesion and he underwent surgical excision. Histologically bronchiolitis oblite­rans organizing pneumonia (BOOP) was reported but no etiology is found. After excision, bilateral pulmonary micronodules which had been previously seen on the computer tomography regressed spon­taneously. In the differential diagnosis of cavitary solitary lesions, BOOP is a rare entity. The case is discussed with a review of the li­terature.