ABSTRACT
It is very rare for the primary lung cancer to metastasize to gastrointestinal tract, which has poor prognosis. A 72-year-old man admitted with dyspnea and a mass lesion in the left lower lobe on chest roentgenogram and chest computed tomogram(CT). Large cell carcinoma of the lung was diagnosed by percutaneous needle biopsy. Also gastroduodenoscopy was conducted for evaluation of gastrointestinal symptoms, such as indigestion and epigastric discomfort. Large cell carcinoma of duodenum was diagnosed by biopsy of duodenal polyp, which was considered to be metastasized from the primary lung cancer. Palliative radiation therapy was performed, but he died 2 months after diagnosis. We report a rare case of large cell carcinoma of the lung with metastasis to uodenum.