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Figure 5b: False-positive multidetector CT angiograms of an aneurysm of the right internal carotid artery. (a) Transverse volume-rendering technique image of a lobulated aneurysm at the left internal carotid artery (arrow) and a broad-based sacculation with a diameter of 2.5 mm directed dorsomedially from the right internal carotid artery (arrowhead). These findings were misinterpreted as a mirror aneurysm. However, DSA revealed an infundibular dilatation of the right posterior communicating artery. (b) Targeted thin-slab maximum intensity projection multidetector CT angiograms obtained at different transverse oblique projections show that the posterior communicating artery (arrowheads) originates from the dilatation and does not run parallel to it. These findings represent an enlarged infundibulum and not an aneurysm.
