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Ruptured dissecting aneurysms of the A1 segment of the anterior cerebral artery: three case reports and a review of the literature

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Abstract

Dissecting aneurysms in the anterior cerebral artery (ACA), although rare, can cause ischemic and/or hemorrhagic stroke. Hemorrhagic dissecting aneurysms in the A1 portion of the ACA are often associated with a poor prognosis. We retrospectively investigated three rare cases of hemorrhagic dissecting aneurysms in the A1 portion. Dissecting aneurysms were diagnosed by carotid angiography or computed tomography angiography to visualize morphological changes in the vessel. All patients presented with diffuse subarachnoid hemorrhage. In one case, computed tomography angiography performed at the onset of the subarachnoid hemorrhage revealed fusiform dilatation at the right ACA (A1), which did not appear on a magnetic resonance angiogram obtained 1 year prior to the onset of the subarachnoid hemorrhage. In the other two cases, A1 dissecting aneurysms were diagnosed from a growing aneurysmal bulge revealed at a non-bifurcated site via repeated carotid angiography. Two patients underwent surgical intervention (trapping or clipping), and their outcome was favorable, whereas the third patient died of delayed rebleeding before receiving surgical treatment. Hemorrhagic dissecting aneurysms in the A1 portion cause severe subarachnoid hemorrhage. Surgical treatments that include revascularization are necessary to prevent rebleeding, and direct surgery is recommended, particularly at the A1 portion.

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Authors and Affiliations

  1. Department of Neurosurgery, Shimane Prefectural Central Hospital, 4-1-1 Himebara, Izumo, Shimane, 693-8555, Japan

    Takafumi Mitsuhara, Fusao Ikawa, Toshikazu Hidaka, Yasuharu Kurokawa & Ushio Yonezawa

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  1. Takafumi Mitsuhara
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  2. Fusao Ikawa
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  3. Toshikazu Hidaka
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  4. Yasuharu Kurokawa
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  5. Ushio Yonezawa
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Correspondence to Takafumi Mitsuhara.

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Mitsuhara, T., Ikawa, F., Hidaka, T. et al. Ruptured dissecting aneurysms of the A1 segment of the anterior cerebral artery: three case reports and a review of the literature. Neurosurg Rev 41, 409–414 (2018). https://doi.org/10.1007/s10143-017-0841-0

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  • DOI: https://doi.org/10.1007/s10143-017-0841-0

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