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Table 3: Summary of specific imaging findings of dissection by technique
Finding Internal Carotid Artery (15 vessels total) Vertebral Artery (10 vessels total)
CT only MRI only Both CT and MRI Total CT only MRI only Both CT and MRI Total
Irregularity 2 0 12 14 4 0 6 10
Pseudoaneurysm 3 0 2 5 1 0 0 1
Flap 7 0 0 7 1 0 0 1
Wall thickening (CT)/crescent sign (MRI) 1 1 13 15 4 0 5 9
Vessel patency 1 0 13 14 2 0 6 8
Acute ischemic stroke 0 3 6 10^* 0 0 4 5^*
Note:—MRI indicates MR imaging.
* Number of patients, rather than vessels. In the remaining 3 patients, there were multivessel dissections that involved at least 1 of both the ICAs and VAs. In 1 patient, acute ischemic stroke was seen on both MRI and CT, whereas the remaining 2 patients did not show signs of acute ischemic stroke on either technique.

Finding	Internal Carotid Artery (15 vessels total)				Vertebral Artery (10 vessels total)
Finding	CT only	MRI only	Both CT and MRI	Total	CT only	MRI only	Both CT and MRI	Total
Irregularity	2	0	12	14	4	0	6	10
Pseudoaneurysm	3	0	2	5	1	0	0	1
Flap	7	0	0	7	1	0	0	1
Wall thickening (CT)/crescent sign (MRI)	1	1	13	15	4	0	5	9
Vessel patency	1	0	13	14	2	0	6	8
Acute ischemic stroke	0	3	6	10^*	0	0	4	5^*