Endoscopic submucosal dissection of multiple flat adenomas in the radiated rectum

Figure 2 A flat adenoma, 35 mm in size, in the anterior wall of the low rectum. A: The lesion was detected as a slight decline in vascular permeability on routine observation; B: Although we could highlight the irregular surface by spraying indigo carmine solution, it was difficult to trace the margin of the lesion; C, D: The surface structure of the lesion is composed mainly of IIIL pits with partially mixed IV pits on magnifying endoscopy with crystal violet staining; E: Figure A showing lesion borders without the aid of yellow lines; F: Figure B showing lesion borders without the aid of yellow lines; G: Magnifying endoscopy with crystal violet staining effectively delineates the margin of the lesion.