PMC7968023_01
(a) Mucosal oedema and an ulcer with a diameter of 10-15 mm in the rectum. (b) Histologic examination: deposition of sevelamer crystals with the typical fish-scale appearance in the ulcerated mucosa.
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Sigmoidoscopy revealed multiple deep ulcers with a diameter of 10-15 mm and diffuse mucosal oedema in the sigmoid colon and rectum (Figure 1(a)). Histologic examination showed deposition of crystals in ulcerated mucosa, without signs of dysplasia, malignancy or chronic inflammation (Figure 1(b)).