case_images: PMC4766803_01
case_images: (a and b) Cranial computed tomography in axial acquisitions showing an expansive lesion in the topography of the left posterior cerebral artery, with an important mass effect. In b, one can observe the partial opacification by means of a venous contrast
case_images: SNI-7-15-g001.jpg
case_images: PMC4766803_01_SNI-7-15-g001.jpg
case_images: F1
case_images: A cranial computed tomography (CT) scan showed a hyperdense expansive lesion adjacent to the left PCA [Figure 1a] with partial and homogeneous opacification following contrast injection [Figure 1b].
case_images: Left vertebral angiography showing a giant aneurysm of the left posterior cerebral artery (a and d); left vertebral angiography after 1 month demonstrating the occlusion of the left posterior cerebral artery at its P2 segment, without opacification of the aneurysm (b and e); (c and f) left vertebral angiography performed 3 years after the first one, showing recanalization of the left posterior cerebral artery and aneurysm (a, b, and c: Towne's view; d, e, and f: Lateral view)
case_images: SNI-7-15-g002.jpg
case_images: PMC4766803_01_SNI-7-15-g002.jpg
case_images: F2
case_images: Subsequently, a cerebral angiography (CAG) was conducted, which demonstrated a giant saccular aneurysm of the P2 segment of the left PCA [Figure 2a and d]. Given this result, we performed another CAG, which confirmed the total occlusion of the aneurysm and the left PCA [Figure 2b and e]. A CAG was also conducted, which confirmed the spontaneous recanalization of the aneurysm and the PCA [Figure 2c and f].
case_images: Cranial magnetic resonance imaging axial acquisition (a: T1-weighted; b: T2-weighted) showing an expansive lesion, with heterogeneous signal, suggesting a totally thrombosed giant aneurysm with occlusion of the posterior cerebral artery
case_images: SNI-7-15-g003.jpg
case_images: PMC4766803_01_SNI-7-15-g003.jpg
case_images: F3
case_images: A cranial magnetic resonance imaging (MRI) scan was performed and showed a lesion with the heterogeneous signal, suggesting a totally thrombosed giant aneurysm of the P2 segment of the left PCA, with occlusion of the artery at its P2 segment [Figure 3a and b].
case_images: Left vertebral angiography demonstrating occlusion of the left posterior cerebral artery at its P2 segment, without opacification of the aneurysm (a, d, and g); in (b, e, and h), the left vertebral angiography performed 3 years after the occlusion shows recanalization of the left posterior cerebral artery and aneurysm (arrow); in (c, f, and i), the new left vertebral angiography shows unchanged aspect of the aneurysm 1 year after recanalization (a, b, and c: Towne's view; d, e, and f: Lateral view; g, h, and i: Right anterior oblique view)
case_images: SNI-7-15-g004.jpg
case_images: PMC4766803_01_SNI-7-15-g004.jpg
case_images: F4
case_images: A CAG performed 1 year later revealed the patency of both the aneurysm and the left PCA, with no major differences in comparison with the previous examination [Figure 4].