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  • Title: Enlargement of basilar artery aneurysms following balloon occlusion--"water-hammer effect". Report of two cases.
    Author: Kwan ES, Heilman CB, Shucart WA, Klucznik RP.
    Journal: J Neurosurg; 1991 Dec; 75(6):963-8. PubMed ID: 1941126.
    Abstract:
    Two patients with distal basilar aneurysms were treated with intra-aneurysmal balloon occlusion. After apparently successful therapy, follow-up angiograms demonstrated aneurysm enlargement with balloon migration distally in the sac. Geometric mismatch between the base of the balloons and the aneurysm neck together with transmitted pulsation through the 2-hydroxyl-ethylmethacrylate (HEMA)-filled balloon directly contributed to aneurysm enlargement. In this report, the authors discuss the problems of progressive aneurysm enlargement due to a "water-hammer effect" and the possibility of hemorrhage following subtotal occlusion.
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