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Aneurysms arising from non-branching sites of the supraclinoid internalcarotid artery (ICA) are considered rare, accounting for only 0.9-6.5% ofall ICA aneurysms. They are thin-walled, broad-based, can easily ruptureduring surgery, and are referred to as dorsal, superior, anterior, or ventralwall ICA aneurysms, as well as blister-like aneurysms. Various treatmentmodalities are available for blister-like aneurysms, but with varying success. Here, we report on two cases of saccular shaped dorsal wall aneurysms. Both patients were transferred to the emergency department with subarachnoidhemorrhage because of an aneurysmal rupture. Computed tomographyangiography and transfemoral cerebral angiography (TFCA) showeda dorsal wall aneurysm in the distal ICA. We performed clipping on thewrapping material (Lyodura®, temporal fascia). Follow-up TFCA showedrapid configuration changes of the right distal ICA. Coil embolization wasalso performed as a booster treatment to prevent aneurysm regrowth. Both patients were discharged without neurologic deficit. No evidence ofaneurysm regrowth was observed on follow-up TFCA at two years. Dorsalwall ICA aneurysms can change in size over a short period; therefore, follow-up angiography should be performed within the short-term. In cases ofregrowth, coil embolization should be considered as a booster treatment.

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