Rupture of inferior phrenic artery aneurysm. An unusual complication of mesenteric arteritis due to postcoarctectomy syndrome.

Postcoarctectomy syndrome was developed in a boy with Williams syndrome. Angiogram revealed widespread changes of visceral arteries and extravasation of the contrast material from the right inferior phrenic artery. Emergency laparotomy was successful. This unusual complication makes clear that the mesenteric arteritis after coarctectomy can cause aneurysm with a risk of rupture.