The authors report an unusual case of upper gastrointestinal bleeding from a hepatic artery aneurysm-duodenal fistula in a 21-year-old male. Arteriography revealed multiple visceral artery aneurysms. Biopsy of the hepatic artery aneurysm (HAA) revealed focal areas of necrosis, medial degeneration, fibrosis, and giant cells. The necrotizing vasculitis plus the multiple visceral aneurysms were highly suggestive of polyarteritis nodosa (PAN). This report reviews the pathophysiology and management of PAN and the diagnosis and management of HAA.
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