[Surgical Resection of Pulmonary Oligometastases of Ampullary Cancer-A Case Report and Review of Seven Cases].

A 62-year-old woman underwent a subtotal stomach-preserving pancreatoduodenectomy for ampullary carcinoma (T3bN0M0, Stage Ⅱb). Histopathologically, the tumor was a tubular adenocarcinoma with mixed features, predominantly the intestinal type, following which adjuvant chemotherapy was not performed. Computed tomography performed 32 months after surgery showed a tumor measuring 6.7 mm in diameter at the apex of the right lung. The tumor had gradually increased in size and measured 10 mm in diameter, 47 months postoperatively. Since other metastatic lesions were absent, partial resection of the right lung under video-assisted thoracic surgery was performed 48 months postoperatively. Histopathological testing confirmed a diagnosis of lung metastasis from the resected specimen of ampullary carcinoma without mediastinal lymph node metastasis. Adjuvant chemotherapy was not performed, and recurrence was not observed even after 53 months following the partial lung resection. Previously, 7 resected cases of solitary lung metastasis from ampullary cancer have been reported. The histopathological sub-type of these 7 cases were intestinal type in 5 and pancreatobiliary type in 2 cases, respectively. No mortality or recurrence was observed for 8-119 months in any of the 7 cases(median, 19 months). In conclusion, owing to the good prognosis, solitary lung metastasis from an ampullary cancer can be classified as an oligometastatic disease, based on the concept proposed by Hellman and Weichselbaum.