Table 2.

The American Cancer Society - US Multi-Society Task Force on CRC (ACS-MSTF) and the American College of Radiology (ACR) surveillance guidelines according to risk groups defined by colonoscopic findings

Risk groups based on colonoscopy findings	Surveillance recommendations
Patients with only one or two small (<1 cm) tubular adenomas with only low-grade dysplasia (low-risk subjects)	5-10 years
Patients with 3 to 10 adenomas, or any adenoma >1 cm, or any adenoma with villous features, or high-grade dysplasia (high-risk subjects)	3 years
High risk subjects with follow-up endoscopy showing normal findings or presence of only one or two small (<1 cm) tubular adenomas with only low-grade dysplasia	5 years
Patients who have more than 10 adenomas at one examination*	<3 years
Patients with sessile adenomas that are removed piecemeal	2-6 months
Patients with small rectal hyperplastic polyps	No follow-up indication