Fig. (20).

False tapering sign appearance of left ICA (A). There is thrombotic occlusion of left carotid terminus extending into M1 segment (B, C). After endovascular thrombolysis (D, E), left ICA return to normal. In fat suppressed T1 obtained before thrombolysis did not yield neither mural T1 hyperintensity nor increase in external diameter of left ICA comparing the right ICA (arrows on F) that would suggest dissection, but intramural hematoma will not be hyperintense in acute stage, external diameters of ICAs are more helpfull in this stage.