Context Segmental arterial mediolysis is an uncommon, non-atherosclerotic, non-inflammatory arteriopathy that involvesareas of dissecting aneurysms and strictures that are caused by outer media lysis of the arterial wall from areas of medialnecrosis of uncertain pathogenesis. It has a predilection for splanchnic arteries and often presents as abdominal pain orhemorrhage in late middle-aged and elderly patients. Diagnosis can be established by computed tomography angiography,magnetic resonance angiography, or angiogram by visualizing typical abnormalities, in addition to excluding othervasculitides. Histological confirmation is the gold standard but is not easily accessible and, as such, is not frequentlyperformed. Case report Here we present an updated review of the literature and a case of segmental arterial mediolysis thatpresented with spontaneous intra-abdominal bleeding near the pancreas that was originally misdiagnosed as hemorrhagicpancreatitis. Conclusion Diagnosis is important because immunosuppressants for vasculitis can worsen the arteriopathy.Segmental arterial mediolysis can be self-limiting without treatment or may require urgent surgical or endovascular therapyfor bleeding and carries a 50% mortality rate. Therefore, it should be included in the differential of causes of abdominal painas well as in cases of unexplained abdominal hemorrhage.
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