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Distal cervical ICA is narrowed (A) with target sign (arrow on B) on CTA, compatible with dissection. Intramural thrombus is hard to see on T1W image (C), but hyperintense on T2W (D) and fat suppressed T1W (E) images (arrows), giving crescent sign on MRI. Thin annular enhancement of vessel wall with eccentric luminal narrowing gives target sign on CTA. Thin annular enhancement of vessel wall is due to the contrast enhancement of the adventitial layer via vaso vasorum.
