[Lung cancer associated with bulla found during an operation of pneumothorax; report of a case].

: A 50-year-old man was admitted to our hospital because of dyspnea. His chest X-ray and computed tomography (CT) showed right pneumothorax and multiple bullae. His pneumothorax was drained with a chest tube, however, because of a persistent air leak, bullectomy was performed 18 days after the occurrence of pneumothorax. Intraoperatively, we found a palpable tumor in the bulla approximately 10 mm in diameter and resected it with the bullae. Histologically, the tumor was diagnosed as a large cell carcinoma.