Abstract
A 59-year-old male was admitted to our hospital because of the right gingival tumor, which was diagnosed as metastatic cancer secondary to large cell lung cancer by the histological examination of the extirpated specimen. He received colonoscopy for bloody stools, which showed easily bled multilocular sub-pedunculated tumor in the sigmoid colon. Histological examination of biopsy specimens suggested metastasis from primary lung cancer. This tumor was regarded as indicative of endoscopic resectien by its figure and resected endoscopically. Because bloody stools had disappeared, we thought that endoscopic resection was effective.