Abstract
intake and helicobacter pylori infection. The presence of thrombi in the smalland medium-sized vessels surrounding the necrotic ulcer on histologic examination suggested PAN. The presence of microaneurysms in both renal arteries on MR angiography corroborated this evidence. It is difficult to come to a diagnosis preoperatively because it is not a common cause of upper GI bleeding. It should be considered in the differential diagnosis in patients with massive upper GI bleeding, with endoscopy showing giant ulcers.
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