Acute arterial mesenteric ischemia and reperfusion: Macroscopic and MRI findings, preliminary report

Figure 2 Macroscopic appearance. A-D: Group I; at baseline evaluation, the bowel loops presented an average diameter of 1.5 mm, uniform serosa and rose-colored mesentery in all segments (A). Pale mesentery and spasm of the jejunal loops (arrowheads) were evident 1 h after acute superior mesenteric artery occlusion (B). Spastic reflex ileus was replaced by definite hypotonic reflex ileus 2 h after acute ischemia (C). Eight hours from acute superior mesenteric artery occlusion, a chromatic change to charcoal black was extended to a large ileal segment (white stars) (D); E-G: Group II; vascular congestion of mesenteric vessels was evident 1 h after reperfusion (E). After 2 h from reperfusion, damaged areas underwent chromatic change from pink to dark red (arrowheads) (F), and became charcoal black after 4 h (stars) (G).