Impact of colorectal cancer screening participation in remote northern Canada: A retrospective cohort study

Table 1 Adenoma and colorectal cancer classification

Classification	Description
LRA	One to three tubular adenomas or sessile serrated adenomas that are each < 10 mm diameter
HRA	Three or more tubular adenomas or an AA described as having at least one of the following features: Size > 10 mm diameter, villous or tubulovillous histology, and/or high-grade dysplasia
AN	Either an AA or cancer
CRC	Cancer identified including early stage (I and II), and late stage (III and IV)

These definitions are in keeping with the United States Multi-Society Task Force colorectal cancer guidelines for colonoscopy surveillance after screening and polypectomy[36,37]. LRA: Low risk adenoma; HRA: High risk adenoma; AN: Advanced neoplasia; CRC: Colorectal cancer; AA: Advanced adenoma.