Relation of vein of Trolard to central sulcus (reported measures and values from relevant studies)
| Authors | Reported measure(s) | Reported value(s) |
| Ikishima et al, 2006 | Prevalence of a pre-central vein of Trolard | 11% |
| Prevalence of a central vein of Trolard (aka Rolandic) | 22% | |
| Prevalence of a post-central vein of Trolard | 41% | |
| Bruno-Mascarenhas et al, 2017 | Average distance (range) in mm from vein of Trolard to central sulcus | Right side 3.90 Left side 4.34 |
| Tomasi et al, 2022 | Average distance (±SD) in mm between Trolard/SSS confluence and central sulcus midpoint | Right side 6.0 (26) Left side 13.1 (30.1) |
Mean diameter of vein of Trolard ranged from 2.1 mm to 3.3 mm in cases of single occurrence (table 5).