Importance of the surrounding colonic mucosa in distinguishing between hyperplastic and adenomatous polyps during acetic acid chromoendoscopy

Figure 1 Linear and regularly patterned colonic mucosa surrounding a polyp. On endoscopic removal, pathology revealed a hyperplastic colon polyp. A: Before spraying with acetic acid a sessile polyp is seen; B: After spraying with acetic acid the colonic mucosa surrounding the polyp has a linear and regular pattern.

Figure 2 Nodular and irregularly patterned colonic mucosa surrounding a polyp. On endoscopic removal, pathology revealed a hyperplastic colon polyp. A: Before spraying with acetic acid a sessile polyp is seen; B: After spraying with acetic acid the colonic mucosa surrounding the polyp has a nodular and irregular pattern.

Figure 3 Diagnosis according to the shape of the colon polyp and the pattern of its surrounding colonic mucosa. Each black dot indicates a polyp. Most of the non-sessile colon polyps revealed linear and regular patterned surrounding colonic mucosa (P = 0.02).