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Summary of findings of patients with presumed MVNT
Demographics33 patients; mean age, 39 yr; female/male ratio (1.4:1)
Clinical dataNonfocal headache (n = 16), possible seizure (n = 8), other reasons (n = 9)
Follow-up scan 24–144 mo (mean, 36.8 mo)
LocationParietal lobe (n = 9), frontal lobe (n = 8), temporal lobe (n = 6), occipital lobe (n = 2), >1 lobe (n = 8)
MRI findings (total)
    Hyperintense lesions on T2WI in comparison with the normal white matter33 (100%)
    Hyperintense lesions on FLAIR in comparison with the CSF33 (100%)
    Hypointense lesions on thin-section T2WI in comparison with the CSF21 (100%)
    Presence of abnormal white matter signal surrounding the bubble-like lesions15 (45%)
    Contrast enhancement1 (3%)
    Restricted diffusion or blooming on susceptibility-weighted imaging0 (0%)