Preoperative marking of a submillimeter metastatic pulmonary tumor using a mobile computed tomography scan with a navigation system: A case report

•A submillimeter metastatic lung tumor was resected successfully by intraoperative marking using a mobile CT with a navigation system.•This method is safer and might be more accurate than the traditional hook wire marking without the necessity of percutaneous lung puncture.•It also reduced a patient’s stress because the whole procedure could be done at a single stage under general anesthesia.