Incidence and predictors of "late" recurrences after endoscopic piecemeal resection of large sessile adenomas.

Background: Large sessile colorectal adenomas (>/=2 cm in size) resected piecemeal have a 0% to 55% rate of residual adenoma at the first follow-up. Guidelines recommend inspection of the polypectomy site 3 to 6 months after resection. Some patients with a negative examination at 3 to 6 months have a subsequent "late" recurrence.