Summary of findings of patients with presumed MVNT
| Demographics | 33 patients; mean age, 39 yr; female/male ratio (1.4:1) |
| Clinical data | Nonfocal headache (n = 16), possible seizure (n = 8), other reasons (n = 9) |
| Follow-up scan 24–144 mo (mean, 36.8 mo) | |
| Location | Parietal 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 matter | 33 (100%) |
| Hyperintense lesions on FLAIR in comparison with the CSF | 33 (100%) |
| Hypointense lesions on thin-section T2WI in comparison with the CSF | 21 (100%) |
| Presence of abnormal white matter signal surrounding the bubble-like lesions | 15 (45%) |
| Contrast enhancement | 1 (3%) |
| Restricted diffusion or blooming on susceptibility-weighted imaging | 0 (0%) |