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Fig 3. Decreased diameter of distal ICA lumen associated with near-occlusion stenosis. A, Axial CTA image at the level of the left distal ICA (arrow) and distal ECA (both enclosed by dashed-line box). B, Magnification of the distal ICA and distal ECA with diameter measurements; in this case, the distal ICA diameter (B, 0.26 cm) is smaller than the distal ECA diameter (A, 0.32 cm). C, 3D-rendered image of the left distal ICA and distal ECA, showing the decreased distal ICA (arrow, distal ICA), secondary to near-occlusion ICA stenosis in this case. Distal ICA reduction that is near equal in diameter to distal ECA is substantially decreased from expected normal as shown in Fig 2). The maximum left ICA bulb stenosis measured 0.07 cm, shown on 3D-rendered image as an amputated segment. Calcification surrounds segments of the left carotid bifurcation.
