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Mesenteric artery occlusion caused by extensive atherosclerosis. (a) The mucosal surface of a segment of jejunum showing ischemic necrosis and two small perforations. (b) Anterior external aspect of the aorta showing takeoff of patent celiac artery (top) and totally occluded superior mesenteric artery (tip of the pen), located 1 cm below the celiac artery.
