[Lung Cancer Cases with Spontaneous Regression]

Case 1 was a 79-year-old man. Computed tomography (CT) showed a nodule in the left upper lobe. Surgery was planned, but the regression of the nodule was noted and the surgery was postponed. Six months later, the nodule shadow increased again, and was surgically resected. Pathological diagnosis was adenocarcinoma. Case 2 was an 82-year-old man. CT showed a nodule in the right lower lobe and surgery was planned, but the nodule regressed. Three months later, it increased and was resected. It was pathological diagnosed as squamous cell carcinoma. Although spontaneous regression of lung cancer is rare, careful follow up of the regressed nodules shadow is required because of possible regrowth after the regression.