Fig. 2
From: Metachronous tubulovillous and tubular adenomas of the anal canal
Findings of the first anal canal tumor. a Endoscopic appearance. b Histological appearance of a low magnification (original magnification: 20 ×). The border between adenoma and normal epithelium is indicated by a pair of arrowheads. Bar indicates 1 mm. The inset shows a higher-magnification view (original magnification: 200 ×)