Thai Journal of Gastroenterology

is one of transition from a precursor (adenoma) to a malignant lesion. Polypectomy can reduce its incidence and the

cancer-related death. The present study is aimed at studying the prevalence of colorectal adenomatous polyp in

patients who underwent colonoscopic studies at the Gastroenterology Unit, Department of Medicine of Rajavithi

Hospital, which is a tertiary care center for many provinces in Thailand. Clinical data were collected prior to the

colonoscopic examinations. All detected polyps were removed and submitted for pathological analysis. The prevalence

of colorectal adenomas was calculated. The data related to known or potential risk factors were analyzed for

any correlation to the prevalence of colorectal adenomas. Results; a total of 200 patients without exclusion criteria

were enrolled. Colonic polyps (any histological categories) were detected in 74 patients in whom polypectomy or

biopsies were carried out. There were 35 patients with tubular adenoma (47.3%), 2 patients with tubulovillous

adenoma (2.7%), 3 patients with villous adenoma (6.38%), 3 patients with adenocarcinoma (6.38%),18 patients

with hyperplastic polyp (24.32%), 12 patients with inflammatory pseudo polyp (16.22%), and 1 patient with a

retention polyp (1.35%). With the exception of age, no significant correlation was found between any risk factor

and the prevalence. Conclusion; the prevalence of patients with colorectal adenomatous polyps in this study was

20%. Age was the only risk factor that was significantly the associated prevalence with adenoma in this study.