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Table 1: 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.