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case_images: CT scan showing colitis in the transverse colon.
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case_images: Imaging of the abdomen via computed tomography (CT) showed inflammatory changes in the transverse colon and rectum, along with rectal wall thickening suggestive of colitis and proctitis (Fig. 1).
case_images: Colonoscopy revealing segmental colitis of the ascending with black-yellow edematous mucosa and deep ulcers in the transverse colon and rectum.
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case_images: Subsequent colonoscopy identified severe segmental colitis in the ascending colon and splenic flexure, in addition to black-yellow, edematous tissue apparent in the colonic mucosa (Fig. 2).
case_images: A) Colonic mucosa with an ischemic pattern of injury, i.e., lamina propria fibrosis, crypt withering, and overlying inflammatory exudate. B) Polypoid necrotic mucosa and fragments of purple-colored material consistent with kayexalate colitis.
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case_images: Histopathological examination of the colonic biopsies disclosed an ischemic pattern of colitis, marked by fibro-inflammatory exudate and mucosal necrosis (Fig. 3).