Symptom	No. of Patients	Approx. Percentages
Pain	22	88%
Only neck pain	4	15%
Only headache	13	50%
Both	5	19%
Headache by location:	..	..
Occipital	12	..
Maxillary	1	..
Temporal	2	..
Others	3	..
Dizziness/vertigo	15	57%
Nausea/vomiting	14	53%
Unilateral facial numbness	12	46%
Unsteadiness	11	42%
Diplopia	6	23%
Dysarthria	4	15%
Dysphagia	3	11%
Limb numbness	3	11%
Limb weakness	3	11%

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Table 2: Possible immediate predisposing factors for dissection

Sports activities: 4 patients (15%)	No of patients
While playing golf	1
While playing soccer	1
While running	1
While playing baseball	1
Associated with chiropractic: 3 patients (11%)	No of patients
During or immediately after chiropractic	2
One day after vigorous chiropractic	1
Possible neck injury: 7 patients (26 %)	No of Patients
Snow board accident 12 days prior to stroke	1
Falling on back one day before	1
Car accident 2 weeks before	1
Truck neck accident 3 years previously	1
Minor neck injury 2 weeks before onset	1
During loading truck	1
During vigorous self-manipulation of neck	1
TOTAL	14/26 (53%)
Chronic risk factors	No of patients
Hypertension	4
Diabetes mellitus	3
Smoking	3
Migraine	1

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Table 3: Initial angiographic findings in 25 patients (total dissecting arteries 31)

Abnormality	Number of Arteries(%)
Irregular stenosis without occlusion	17 (54%)
Occlusion with stenosis	13 (42%)
Level of dissection:	.
Extracranial (C1-C2)	16 (51%)
Extracranial (other locations)	7 (22%)
Intracranial dissection	8 (25%)
False aneurysm	6 (19%)
Signs of fibromuscular dysplasia	2 (6%)
Cerebral angiography of 25 patients with VA dissection:
Patients with Unilateral VA dissection	19 (76%)
Patients with Bilateral VA dissection	6 (24%)

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