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Table 3: Diagnosis as determined by digital subtraction angiography
All Men Women
Diagnosis after initial DSA 
    No causative lesion 201 (87%) 110 (55%)^{^a} 91 (45%)
    Aneurysm 12 (5%) 3 (25%) 9 (75%)
    Arteriovenous malformation 2 (1%) 1 (50%) 1 (50%)
    Arteriovenous fistula 1 (0.5%) 1 (100%) 0 (0%)
    Vasculitis/vasculopathy 15 (7%) 3 (21)^{^b} 11 (79%)
↵a P = .01 by Fisher exact test.
↵b P = .03 by Fisher exact test.