PMC4462615_01
(a) A CT scan taken on admission showed a subarachnoid hemorrhage (SAH) in the left cerebellopontine cistern, ambient cistern and sylvian fissure. (b) The 3D computed tomographic angiography depicted the right anterior choroidal artery (AChA) aneurysm (arrow). (c) Magnetic resonance fluid attenuated inversion recovery images demonstrated that the SAH was continuing from the AChA aneurysm (arrow head); L: Left, R: Right
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F1
A computed tomography (CT) scan showed subarachnoid hemorrhage (SAH), the distribution of which was dominant in the left side and relatively localized in the posterior fossa [Figure 1a]. CTA demonstrated a 4 mm aneurysm with blebs in the direction to the left side in the right anterior choroidal artery (AChA) [Figure 1b]. Based on a magnetic resonance image performed at a previous hospital, the AChA aneurysm was thought to be a ruptured aneurysm [Figure 1c].
(a) The 3D rotational angiography showed a small aneurysm (arrow head) on the left anterior inferior cerebellar artery (AICA). (b) The lateral view of the 2D digital subtraction angiogram failed to depict any aneurysms. (c) An intraoperative photograph. (d) Neck clipping of the aneurysm; VIII: Acoustic nerve, IAA: Internal auditory artery
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F2
A small aneurysm measuring 1 mm in maximum diameter was depicted with 3DRA at the meatal segment of the left AICA [Figure 2a]. The AICA aneurysm was not noted by 2DDSA [Figure 2b]. The aneurysm was completely clipped, preserving the AICA main trunk, but the internal auditory artery that divided from the aneurysmal dome was difficult to preserve [Figure 2c and d].