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Spontaneous hemoperitoneum resulting from segmental arterial mediolysis.

Segmental arterial mediolysis is a rare but potentially life-threatening arteropathy of medium to large arteries that can be managed with endovascular treatment for patients who are hemodynamically unstable. We present a case of segmental arterial mediolysis in a 73-year-old woman who developed spontaneous hemoperitoneum in the emergency department after initially presenting with unrelated upper respiratory complaints. Her initial computed tomography revealed an aneurysm arising off the right hepatic artery. She was taken to the interventional radiology suite for embolization and multiple aneurysms along the right hepatic artery were identified that had the appearance of segmental arterial mediolysis. She initially stabilized but then developed acute renal failure and had a decrease in hemoglobin on postprocedure day 2. She was taken back to the angiography suite where multiple small left gastric and left hepatic trunk aneurysms were identified, with a small area of extravasation evident. The vessel was coiled from the liver to the origin of the left gastric artery. She was discharged and had a follow-up angiogram 2 months later, which showed interval development of an aneurysm to the distal right hepatic artery.

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