PMC3622354_01
Brain CTA axial source image, (a) Brain CTA reconstruction, (b) Brain MRI axial T1WI postgadolinium, (c) Both noninvasive modalities show a small dilatation in the region of the right PCA (white arrow)
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The CTA revealed a rounded bulge arising from the right distal P1 segment of the right posterior cerebral artery (PCA) [Figure 1a and b], suspicious for a saccular aneurysm. T1WI postgadolinium sequence, and no mass in the interpeduncular or crural cisterns, making a dissecting aneurysm much less probable [Figure 1c].
Left vertebral artery injection, (a) 2D angiography and, (b) 3D rotational angiography and left common carotid artery injection (c) 2D angiography and, (d) 3D rotational angiography. a and b show the double peaked shape infundibulum (white arrow) arising proximal to the junction of the right PcomA and PCA. (c and d) the two infundibuli (white asterixis) at the origins of the left AchoA and left PcomA
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A catheter angiogram with 2D projections and 3D rotational reconstructions revealed a small 3 mm outpouching just proximal to the junction of the right posterior communicating arteries (PcomA) and PCA [Figure 2a and b]. The catheter angiogram also enabled visualization of two additional small infundibula, each measuring approximately 2 mm in maximal diameter at the origins of the left anterior choroidal artery (AchoA) and left PcomA [Figure 2c and d].