|
FIG 2. A-D, Selected source scans from a CT angiogram of a 45-year-old man. Unlike those shown in Figure 1, these scans reveal discontinuity of the intraluminal left ICA contrast column, reflecting an occluded vessel (arrow in A indicates residual ICA lumen; arrows in B-D indicate unopacified ICA lumen/enhancing vasa vasorum). Scans progress from inferior to superior levels.
E, Curved reformatted projection constructed from this CT angiography dataset shows left ICA occlusion, with absent intraluminal contrast opacification. An opacified ascending pharyngeal artery (arrow) mimics a patent left ICA but cannot be followed into the petrous canal.
F, Lateral view digital subtraction arteriogram obtained during injection of the left common carotid artery confirms total occlusion of the proximal left ICA.
|