MCA geometric features (N=158)
| Covariate | Ipsilateral side | Contralateral side | P value |
| M1 length, mean±SD, mm | 19.3±6.8 | 18.2±6.8 | 0.0534 |
| M1 proximal diameter, mean±SD, mm | 2.3±0.4 | 2.3±0.4 | 0.6127 |
| M1 distal diameter, mean±SD, mm | 1.9±0.4 | 2.1±0.4 | <0.0001 |
| M1 diameter ratio (proximal/ distal), mean±SD | 1.2±0.2 | 1.1±0.1 | <0.0001 |
| M1 shape and curve orientation (axial), N (%) | 0.1814 | ||
| Dorsal | 79 (50.0) | 93 (58.9) | |
| Ventral | 35 (22.1) | 22 (13.9) | |
| Straight | 36 (22.8) | 38 (24.0) | |
| Sigmate | 8 (5.1) | 5 (3.2) | |
| Bending angle (axial), mean±SD | 154.4±18.4 | 155.6±17.8 | 0.4167 |
| M1 shape and curve orientation (coronal), N (%) | 0.0414 | ||
| Superior | 85 (53.8) | 91 (57.6) | |
| Inferior | 48 (30.4) | 28 (17.7) | |
| Straight | 16 (10.1) | 31 (19.6) | |
| Sigmate | 9 (5.7) | 8 (5.1) | |
| Bending angle (coronal), mean±SD | 148.0±21.0 | 152.2±20.0 | 0.0500 |
| M1/M2 angle, mean±SD | 128.3±23.4 | 134.0±24.3 | 0.0074 |
| MCA bifurcation angle, mean±SD | 80.3±25.1 | 94.4±25.6 | <0.0001 |