A Case of a Perforated Metastatic Gastric Tumor Arising From Lung Cancer

Abstract

A 58-year-old-man was diagnosed as having an adenocarcinoma (p-T2aN2M0, p-Stage Ⅲa) in the right superior lobe of the lung. The patient underwent the resection of the right superior lobe; 23 months later, he was diagnosed as having lymph node metastases. Multiple lung metastases were subsequently observed. Accordingly, systemic chemotherapy and radiation treatment were initiated. Three years and nine months after the initial surgery, the patient visited our hospital complaining of epigastric pain and dyspnea. An abdominal computed tomography examination revealed the presence of free air. We suspected an upper gastrointestinal perforation and performed a gastrectomy. A histopathological examination confirmed the presence of adenocarcinoma and a metastatic gastric tumor; immunohistochemical test results showed that the metastases had originated from the lung cancer. The patient died 1 month after a gastrectomy. Here, we report a rare case of a perforated metastatic gastric tumor originating from lung cancer. As the prognosis of patients with perforated metastatic gastric tumor originating from lung cancer is relatively poor, the patient's individual characteristics should be carefully considered when devising a treatment strategy.