Fig. 1. Colonoscopy findings. (A) In a colonoscopy performed two years earlier, an abnormality in the colon wall at the mid-rectum at the six o’clock position was observed, but it was overlooked at the time, and a biopsy was not performed. (B) Upon endoscope insertion, a firm concentric in-growing mass-like lesion with a significantly narrowed rectal lumen was observed at 10 cm from the AV. (C) The findings observed by retroflexion of the narrowed area show a stenotic area tightly constricted the endoscopic scope. (D) Redness, mucosal nodularity, and shallow ulceration were observed in the stricture area during scope withdrawal.

Korean J Gastroenterol 2024;84:282~287 https://doi.org/10.4166/kjg.2024.091

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