Abstract
Although linear mucosal tears have been reported, we found a relatively rare case of wavy mucosal tear in collagenous colitis. This may be related to the mutual weak adhesiveness between the epithelium and collagen band. This complication necessitates great care to be taken while performing colonoscopy in patients suspected of collagenous colitis.
Highlights
A 78‐year‐old woman was admitted with a three‐month history of watery, nonbloody diarrhea, and bodyweight loss
During removal of the colonoscope, we found a 5‐cm‐long wavy mucosal tear in the sigmoid colon (Figure 1)
Collagenous colitis was diagnosed based on hematoxylin‐eosin stain (Figure 2) and Azan stain (Figure 3) of the specimens which showed irregular thickening of the subepithelial collagen band with focal peeled surface epithelium (Figure 2; white arrows)
Summary
A 78‐year‐old woman was admitted with a three‐month history of watery, nonbloody diarrhea, and bodyweight loss. Physical examination and stool and blood test results were unremarkable.
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