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The clinical and radiological features of idiopathic aneurysmal dilatation of the ileum in 3 adult patients are described. This uncommon lesion presents as an aperistaltic saccular segment in direct continuity with the normal ileal lumen. On barium examination of the small bowel, however, it may closely resemble and be mistaken for a Meckel's diverticulum. Previous reports about this entity manifesting in the pediatric age group are reviewed.

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In the case reported herein, hemobilia was caused by an aneurysm of the left gastric artery which arose as a separate vessel from the aorta. The role of subselective angiography in the evaluation of hemobilia is emphasized.