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TABLE 2: 
Results of classification of vertebrobasilar abnormalities in 385 patients
Atherosclerosis (S)28(7.3%)
Occlusive condition (O)18(4.7%)
Hypoplastic vertebral artery (H)23(6.0%)
Aneurysm (A)6(1.6%)
S + O10(2.6%)
S + H3(0.8%)
S + O + A2(0.5%)
Total90(23.4%)