Table 2.

Colorectal Polyp Definitions

Type of colorectal polyp		Definition
Advanced adenoma	AA	Large tubular adenoma ≥1cm, or any adenoma with villous histology or high-grade dysplasia
Advanced serrated polyp	ASP	Large sessile serrated polyp ≥1cm, or SSP with any grade of cytological dysplasia, or traditional serrated adenoma ≥1cm or large hyperplastic polyp ≥1cm diagnosed proximal to the splenic flexure and/or with endoscopic features suggestive of SSP*
Advanced colorectal polyp	ACP	Advanced adenoma or advanced serrated polyp (AA+ASP)
High-risk adenoma	HRA	Advanced adenoma, or the presence of ≥3 adenomas

^*Flat or sessile shape, indistinct border, mucus cap, rim of debris, cloud-like surface, lacy vessel pattern⁴⁵