[Mycobacterium avium complex (MAC) infection needed differential diagnosis of the recurrence after surgery for double lung cancer; report of a case].

A 62-year-old woman had undergone video-assisted thoracic surgery (VATS) -right upper lobectomy and right S8 segmentectomy for double lung cancers (papillary adenocarcinoma and bronchioloalveoler carcinoma, stage IA). Four years later, chest computed tomography (CT) showed abnormal shadow, 20 mm in size, along the staple-suture line. The 3 months later, new lesion, 15 mm in size, was observed in right lower lobe. CT-guided biopsy revealed no malignancy. The patient underwent partial resection of the right lower lobe and tumorectomy. The tumor was solid and cystic mass. Histopathologically, the tumor was granuloma infected by Mycobacterium avium. The patient was discharged on 17th postoperative day, and doing well without new lesion for 9 months postoperatively.