Fig. 4

Microscopy evaluation of small bowel perforation. a. Hematoxylin and eosin (H&E) stained slides of normal small intestine (left panel), low magnification of perforated small intestine showing ulceration and perforation (center panel) and high magnification of perforated small intestine showing acute inflammation and mucosal ulceration (right panel). b. H&E slides of medium (left panel) and small (left and right panel) vessels associated with the small intestine. No evidence of vasculitis is seen. c. Section of small intestine H&E and trichrome stained showing ulceration with perforation through the serosa (arrow heads) with loss of muscularis propria (arrows) and acute and chronic inflammation and fibrosis