Demographics and arteriovenous malformation specifics in 36 patients who underwent preoperative embolization with Onyx
| Characteristics | Before Embolization | After Embolization | P value |
|---|---|---|---|
| Age (y); median (range) | 41 (12–62) | ||
| Sex, no. pts (%) | |||
| Male | 15 (37) | ||
| Female | 26 (63) | ||
| Presentation, no. pts (%) | |||
| Hemorrhage | 19 (46) | ||
| Other (seizure/headache) | 22 (54) | ||
| AVM specifics | |||
| Side, no. pts (%) | |||
| Left | 19 (46) | ||
| Right | 20 (49) | ||
| Midline | 2 (5) | ||
| Location, no. pts (%) | |||
| Supratentorial | 36 (88) | ||
| Infratentorial | 5 (12) | ||
| Eloquence*, no. pts (%) | 31 (77) | 18 (50) | 1.00 |
| Size† (cm), mean ± SD | 3.70 ± 1.55 | 3.06 ± 1.89 | < .05 |
| Deep venous drainage, no. pts (%) | 20 (54) | 18 (50) | .16 |
| No. (%) pts with reduced SMG | 10 (24) | < .05 |
Note:—AVM indicates arteriovenous malformation; no. pts, number of patients; SMG, Spetzler-Martin grade.
* Eloquent regions included deep structures such as the hypothalamus, thalamus, brainstem, and cerebellar peduncles as well as cortical regions such as the sensorimotor, language, and primary visual areas.
† Maximal diameter of the perfused nidus.