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case_images: Rectosigmoidoscopy showing large and deep ulcers in the rectosigmoid junction.
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case_images: Colonoscopy revealed normal rectal mucosa but deep, large ulcers at the rectosigmoid junction, prompting cessation of further exploration (Figure 1).
case_images: Results of the histological study of colonic specimen. (a) Marked exudate on the surface of the mucosa (HE stain x 40); (b) Mucosal hyalinization, denudation and vascular congestion with atypical reactive change of crypts (HE stain x 100).
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case_images: These histological findings confirmed acute ischemic colitis (Figure 2).