Video 1 An useful method for lesions that are vertically confronted with the endoscope. Fig. 1 The lesion was a 20 mm IIa lesion at the ascending colon. Fig. 2 The anchor traction method converted the lesion's orientation to a tangential angle, resulting in easier and safer submucosal dissection. Fig. 3 Pathological analysis revealed that the lesion was a 22 15 mm high grade dysplasia with negative margins.
Yamada et al. (Sun,) studied this question.