Abstract
A 67-year-old man was referred to the hospital because of diarrhea. He had been suffering from diabetes mellitus, hyperlipidemia and hypertension. Colonoscopy showed a pedunculated polyp in the sigmoid colon and a sessile translucent tumor measuring 3 cm in size in the transverse colon. The pedunculated polyp was removed by polypectomy and diagnosed as well-differentiated intramucosal cancer. Endoscopic ultrasonography of the large sessile tumor revealed an anechoic mass with septa. It was treated by endoscopic mucosal resection using sodium hyaluronate and was diagnosed as a lymphangioma. An accurate endoscopic diagnosis of a lymphangioma is indispensable before treatment. And careful observation is necessary in order to find possible coexisting colorectal tumors. Submucosal injection of sodium hyaluronate is thought to be a good option for safer endoscopic resection.
