A 65-year-old man who had an intracavitary mass surrounded by an air-crescent in the right side on his chest radiogram was diagnosed as aspergilloma. Any malignancy was not presented despite transthoracic and bronchoscopic biopsy. Since he had poor pulmonary function tests (PFD and physical condition, pulmonary resection was not considered. He underwent cavernostomy and muscle flap transposition. Microscopic examination revealed aspergilloma and adenocarcinoma. Amphoterici- ne-B and radiotherapy was given postoperatively. This case showed us that old cavities could contain both fungus ball and adenocarcinoma.