Question: A 53-year-old woman with history of colon polyps came in for a routine surveillance colonoscopy. She had no GI symptoms and preprocedure vital signs were stable. The examination was complete up to the cecum with an excellent preparation. The only finding was a centrally depressed mass in the distal transverse colon with raised erythematous enlarged folds surrounding it (Figure A). A few cold biopsies were taken from the edge of the mass. A tattoo and a clip were placed on the normal mucosa just distal to the mass.