We experienced a case of ESD-resected retum-origin MALT-lymphoma. A 74-years old female visited our hospital for intestinal examination. The total colonoscopy revealed a rectal polyp with tubular adenoma diagnosis. 3-months later, the patient admitted to our hospital for polyp resection. The rectal polyp feature had changed, resembling carcinoid appearance. The polyp was resected by ESD method for definite diagnosis, and was diagnosed as MALT-lymphoma. We have planned PET-examination, and Helicobacter pylori eradication in future.
