Retrospective review summary of brain MR imaging studies, notch count, and position
| Review Summary | |
|---|---|
| Brain MR imaging studies reviewed (No.) | 1639 |
| Brain MR imaging studies, with notches (No.) | 823 |
| Notches identified in 823 MR imaging studies (No.) | 1102 |
| Female (No.) (%) | 919; 56 |
| Notch identified | 460; 50 |
| Male (No.) (%) | 720; 44 |
| Notch identified | 363; 50 |
| Anterior position (No.) (%) | 344; 31 |
| Posterior position (No.) (%) | 660; 60 |
| Undulating, >2 notches (No.) (%) | 98; 9 |
| Pericallosal artery notch association (No.) (%) | 490; 60 |