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FIG 1. A-D, Selected axial view source scans from a CT angiogram of a 74-year-old female patient show continuity of the contrast-filled lumen (arrows) in consecutive axial views of the right ICA, reflecting a patent vascular lumen. Scans progress from inferior to superior levels, beginning at the patent carotid bifurcation. Note that in A, the jugular vein, posterior and lateral to the carotid artery, has not yet opacified.
E, Sagittal view curved reformatted projection of this CT angiography dataset shows a hairline residual right ICA lumen with a slim sign extending into the petrous canal at the skull base. Note that the vessel appears falsely discontinuous along portions of the scan, which is a potential pitfall of this postprocessing technique, emphasizing the need for review of the axial view source scans. ICA origin is seen just superior to a discontinuous segment (arrow).
F, Lateral view digital subtraction arteriogram obtained during injection of the right common carotid artery confirms critical stenosis of the right ICA origin, with diffuse narrowing (hairline residual lumen) of the more distal right ICA.
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