Underwater endoscopic mucosal resection for neoplasms in the pyloric ring of the stomach: Four case reports

Table 1 Patient characteristics

Case No.	Age (yr)/sex	Neoplasm diameter	Yamada classification	Location of the lesion	Procedure time (s)	En bloc resection	Pathology
1	48/Female	10 mm	III	LC-AW	129	Yes	Hyperplastic polyp
2	64/Female	7 mm	II	PW	169	Yes	Hyperplastic polyp
3	50/Male	10 mm	I	GC	147	Yes	Low-grade dysplasia
4	60/Female	10 mm	II	PW	144	Yes	Hyperplastic polyp

AW: Anterior wall; GC: Great curvature; LC: Lesser curvature; PW: Posterior wall.