The patient was 58 years old and underwent sigmoid colectomy and descending colorectal anastomosis for sigmoid colon cancer in August 2009. He had a history of hypertension and had undergone laparoscopic cholecystectomy 5 months ago. After admission, all tumor markers were measured in the normal range, and colonoscopy showed no signs of tumor recurrence. Pulmonary function was measured as moderate obstructive ventilatory dysfunction, with the ability to climb 4 floors and 35 seconds of breath-hold test. Diagnosis: double lower lung occupancy, lung metastasis of colon cancer was possible. Chest CT is shown below: Shen Zhen Yun, Department of Thoracic and Cardiovascular Surgery, Aviation General Hospital of China Medical University On 2010-10-28, thoracoscopic wedge resection of the mass in the basal segment of both lower lungs was performed under general anesthesia, with complete resection of the tumor, and the intraoperative rapid frozen pathology was adenocarcinoma, which was considered as colon cancer lung metastasis cancer in combination with medical history. Discussion: Surgery can be considered for single metastatic lung cancer. The prerequisites are that the primary cancer is effectively controlled without signs of recurrence and that the metastatic lung cancer is solitary or confined to one lobe. In this case, although the patient had double lower lung metastases, each side was a single isolated lesion. Minimally invasive thoracoscopic surgery makes it possible to surgically resect part of the metastatic lung cancer. The surgery avoids lobectomy as much as possible, and the selection of a reasonable thoracoscopic operation port is an important prerequisite for the successful completion of the surgery, which is confirmed to be a metastatic tumor, and adjuvant chemotherapy should be continued after the surgery.