1. Presented by John Yardley, M.D. and Michael Torbenson, M.D. and prepared by Angelique W. Levi, M.D.


A 28-year-old man presented with a three-year history of rectal bleeding. A colonoscopic examination showed nodularity, erythema and edema limited to the ascending and transverse colons. A representative biopsy from the ascending colon is shown. Biopsies from descending and sigmoid colon showed mild patchy chronic inflammation and crypt distortion. The biopsy from the rectum was unremarkable.

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