Fig. 2.

 Large colorectal sessile tumors. a Initial mucosal incision approximately 20 mm long is made approximately 10 mm from the distal side of the tumor after submucosal injection. b Creation of a submucosal pocket under most of the tumor. c, d Severe fibrosis with muscle retraction at the center of the lesion and extension of the submucosal pocket on both sides of the fibrosis. e Dissection of the fibrotic area. f Opening the lower side of the pocket proximally and dissection of the remaining area in the same manner.