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 * [[Image:CD serpiginous ulcer.jpg|200px|Serpiginous ulcer in Crohn's disease]]

A classic endoscopic finding in Crohn's disease is the colonic serpiginous ulcer, depicted here. Crohn's disease was independently described in 1904 by Polish surgeon Antoni Leśniowski and in 1932 by American gastroenterologist Burrill Bernard Crohn, for whom the disease was named. Crohn, along with two colleagues, described a series of patients with inflammation of the terminal ileum, the area most commonly affected by the illness. Crohn's disease affects between 400,000 and 600,000 people in North America.