Lung metastasis from breast cancer combined with primary lung cancer: Report of a case

We herein report a case of lung metastasis from breast cancer combined with primary lung cancer. A 59-year-old female had received mastectomy 5 years ago, and underwent adjuvant chemotherapy with trastuzumab and anastrozole. Chest computed tomography revealed nodules in right lobe of lung. She underwent partial resection through video-assisted thoracoscopic surgery, and metastatic breast cancer and primary lung cancer were recognized on pathological diagnosis. Two years later after chemotherapy and exemestane with trastuzumab, she was pointed out lung cancer recurrence and has been receiving chemotherapy. When nodules are removed and diagnosed as lung metastasis combined with primary lung cancer, additional treatment should be considered depending on the prognosis of each disease