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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 identified460; 50
Male (No.) (%)720; 44
    Notch identified363; 50
Anterior position (No.) (%)344; 31
Posterior position (No.) (%)660; 60
Undulating, >2 notches (No.) (%)98; 9
Pericallosal artery notch association (No.) (%)490; 60