Demographic and angioarchitectural characteristics of patients with M-AVMs
| Variables | I | II | III | IV | Total |
| Age (years) | 27.9±12.1 | 26.1±14.4 | 22.6±12.7 | 29.1±16.6 | 26.3±13.4 |
| Male sex (%) | 31 (62.0) | 15 (60.0) | 16 (47.1) | 7 (43.8) | 69 (55.2) |
| Side (left) | 20 (40.0) | 11 (44.0) | 15 (44.1) | 9 (56.2) | 55 (44.0) |
| Size | 37.4±13.6 | 31.2±18.0 | 40.8±15.9 | 34.1±13.6 | 36.8±15.2 |
| Haemorrhage* | 9 (18.0) | 10 (40.0) | 8 (23.5) | 6 (37.5) | 33 (26.4) |
| Deep perforating artery supply | 6 (12.0) | 3 (12.0) | 14 (41.2) | 13 (81.2) | 36 (28.8) |
| Deep venous drainage | 0 (0) | 1 (4.0) | 3 (8.8) | 8 (50.0) | 12 (9.6) |
| Diffuseness | 14 (28.0) | 6 (24.0) | 15 (44.1) | 5 (31.2) | 40 (32.0) |
| Mean Spetzler-Martin grade | 2.1±0.8 | 2.6±0.6 | 2.9±0.6 | 3.1±0.6 | 2.6±0.8 |
| Complications† | 4 (8.0) | 1 (4.0) | 5 (14.7) | 3 (18.8) | 13 (10.4) |
*Preoperative haemorrhage presentation.
†Surgical complications, including intracranial infection, rehaemorrhage and cerebral infarction.
M-AVM, arteriovenous malformation located in motor-related areas.