Fenestration refers to localised duplication of the vessel and the reported incidence of the basilar fenestration on angiography is 0.3-0.6%. [1] In basilar artery, fenestration typically occurs at the lower end. [2] Medial wall defects with absent media and discontinuity of elastin make fenestration limb of the artery more prone to aneurysm formation. [2] We describe a case of basilar fenestration with a saccular aneurysm treated successfully with endovascular approach.
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