Colonic Adenoma Patients have Higher Incidence of Hyperplastic Polyps on Surveillance Colonoscopy

Category: Colorectal

Background: Distal hyperplastic polyps may be associated with an increased risk of proximal adenomas. However significance of hyperplastic polyps in surveillance colonoscopy is not known in adenoma patients.

Aims: To determine the incidence of hyperplastic polyps during surveillance colonoscopy in adenoma patients.

Methods: Patients undergoing surveillance colonoscopy for previous hyperplastic and adenomatous polyps were included. Histological feature of polyps were compared between initial and subsequent examination.

Results: A total of 64 patients (isolated adenoma=16, hyperplastic=30, mixed=16) underwent colonoscopic surveillance during the study period from Jan 2004 to Dec 2005. Mean follow up interval for surveillance colonoscopy was 28.4, 30.6 and 31.2 months for isolated adenomas, hyperplastic and mixed groups. On surveillance colonoscopy hyperplastic polyps were found in 74% and 62% of patients with hyperplastic and adenoma groups respectively. Adenoma recurrence was seen in 20% and 38% of hyperplastic and adenoma groups respectively. A substantial number of patients (80%) with isolated adenoma had hyperplastic polyps on surveillance colonoscopy.

Conclusions: A significant proportion of adenoma patients demonstrate hyperplastic polyps on surveillance colonoscopy.