case_images: PMC8492441_01
case_images: A computed tomography image shows the subdural hematoma (dotted line) within the posterior fossa and cervical spine.
case_images: SNI-12-458-g001.jpg
case_images: PMC8492441_01_SNI-12-458-g001.jpg
case_images: F1
case_images: On exam, he was intubated, with a Glasgow coma scale of 9, and imaging of the head and neck revealed a subdural hematoma of the posterior fossa and the cervical spine [Figure 1].
case_images: (a) A 3D reconstruction of the left occipital artery angiogram that shows the aneurysm. (b) A subtracted angiographic image of the left occipital artery that shows the occipital artery and the aneurysm.
case_images: SNI-12-458-g002.jpg
case_images: PMC8492441_01_SNI-12-458-g002.jpg
case_images: F2
case_images: Postoperative cerebral angiography showed an intracranial aneurysm arising from the retro-mastoid branch of the OA on the left side [Figure 2].
case_images: (a) A subtracted angiographic image (pre-embolization) of the left occipital artery (capillary phase) that shows the cerebellar blood supply. (b) A subtracted angiographic image (post-embolization) of the left occipital artery (capillary phase) that shows the diminished cerebellar blood supply.
case_images: SNI-12-458-g003.jpg
case_images: PMC8492441_01_SNI-12-458-g003.jpg
case_images: F3
case_images: Balloon test occlusion of the OA showed some cross filling of the left lower cerebellar hemisphere through the left posterior inferior cerebellar artery (PICA) [Figures 3 and 4].
case_images: (a) A subtracted angiographic image (pre-embolization) of the left posterior inferior cerebellar artery (late-arterial phase) that shows the cerebellar blood supply. (b) A subtracted angiographic image (post-embolization) of the left occipital artery (late-arterial phase) that shows the increased cerebellar blood supply.
case_images: SNI-12-458-g004.jpg
case_images: PMC8492441_01_SNI-12-458-g004.jpg
case_images: F4
case_images: Balloon test occlusion of the OA showed some cross filling of the left lower cerebellar hemisphere through the left posterior inferior cerebellar artery (PICA) [Figures 3 and 4].
case_images: MRI image (diffusion-weighted sequence, axial view) that shows the minor stroke of the left cerebellar hemisphere after embolizing the occipital artery aneurysm along with the parent vessel.
case_images: SNI-12-458-g005.jpg
case_images: PMC8492441_01_SNI-12-458-g005.jpg
case_images: F5
case_images: The patient tolerated the procedure well, and magnetic resonance imaging of the brain showed a minor left-sided cerebellar infarct, which was asymptomatic [Figure 5].