Table 1.

The various classes of colorectal polyps.

Types	Average Size	Cancerous	Frequency in Patients
Tubular adenomas	1 to 12 mm	Non-cancerous	50%
Villous adenomas	≥20 mm	Cancerous	5%
Tubulovillous adenomas	≤1 cm	Cancerous	8–16%
Serrated adenomas	≤10 mm	Non-cancerous	15–20%
Hyperplastic	≤5 mm	Non-cancerous	20–40%
Inflammatory	≤2 cm	Non-cancerous	10–20%