PMC2797595_01
Thick arrows indicate ulcers and thin arrows indicate macroscopic mucosal erosions
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The perforations were 20 mm, 7 mm and 3.5 mm in diameter with a sharp margin of ulcer, a round, punched out figure (Figure 1).
(2A) Congestion, exudate and ulcer base with inflammation (H&E x10). (2B) Perforation along whole thickness of the bowel wall with exuda and erosion (H&Ex5)
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Small venules and small arterioles in the submucosa and muscular layer of the entire colon segment were surrounded by extensive edema and diffuse mononuclear inflammatory cells (Figure 2).