PMC3622374_01
(a) Preoperative MRI, T1w sequences with gadolinium injection: Aneurysm mass located in the left Sylvian fissure, (b) Preoperative angiography showing the aneurysm's injection from a branch of the middle cerebral artery, (c) Postoperative angiography showing the complete exclusion of the aneurysm from the circle
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F1
Although her neurological exam was normal, a brain magnetic resonance imaging (MRI) showed an intracranial mass (about 4 cm) located in the left Sylvian fissure; the mass was hypointense in T1 weighted (T1w) sequences and showed inhomogeneous enhancement after gadolinium injection [Figure 1a]. Angiography confirmed the presence of an aneurysm originating from the M2 tract [Figure 1b]. Angiography showed the complete exclusion of the aneurysm from the circle [Figure 1c]; injection in the left vertebral artery showed collateral circles from the posterior cerebral artery, which supplied the temporal lobe [Figure 2a and b].
Postoperative angiography, (a) Injection of the left internal carotid artery showing no distribution of the contrast in the left temporal lobe (arrows), (b) Injection of the basilar artery, which demonstrates the collateral circle from the posterior cerebral artery supplying the left temporal lobe (arrows)
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F2
Angiography showed the complete exclusion of the aneurysm from the circle [Figure 1c]; injection in the left vertebral artery showed collateral circles from the posterior cerebral artery, which supplied the temporal lobe [Figure 2a and b].