Analysis of 234 cases of colorectal polyps treated by endoscopic mucosal resection

Table 3 Comparison of morphological characteristics of each group under endoscopy

Groups	Polyp pattern					Yamada type
	Bloody, red	Smooth	Coarse, not smooth	Leaflets	Eroded	I	II	III	IV
Non-adenoma	15	25	8	5	4	2	12	14	13
Low-risk adenoma	53	44	53	11	5	0	43	39	28
High-risk adenoma	88	23	52	59	10	1	19	48	71
Carcinogenesis	0	0	5	2	1	1	1	0	3
χ2 value	75.257					47.676
P value	0					0