Fig. 4

a The anal margin of the lesion could not be displayed before using the transparent hood; b, The transparent hood could provide a clear view; c, A circumferential mucosal incision was performed; d, A haemoclip was placed on the submucosal tissue directly beneath the hood and provided proper counter traction during the procedure; e, The anchored haemoclip was remarkably helpful for visualizing and dissecting the submucosal tissue during the procedure; f, The lesion was resected en bloc and fixed by insect needles. A is anal margin of the resected specimen and O is oral margin of the resected specimen