[A Case of Small Bowel Perforation Due to Lung Cancer Metastasis].

A 79-year-old man was diagnosed with Stage ⅢB(T4N2M0)adenocarcinoma of the lung, administered. He suddenly developed abdominal pain with muscle guarding and rebound tenderness. An abdominal computed tomography scan revealed a thickened small bowel wall and mesenteric mass, as well as massive ascites and free air. He underwent an emergency laparotomy following a diagnosis of pan-peritonitis due to intestinalperforation. A partialresection of the smallintestine and abdominal drainage were performed. The resected specimen included an ulcerative lesion on the mucosal surface. The pathological diagnosis was a metastasis of lung cancer. The patient died in hospice 29 days postoperatively. In the present case, however, surgery improved the patient's quality of life. Although lung cancer metastasis to the small bowel is associated with a poor prognosis, palliative surgery is indicated in otherwise fatal circumstances.