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Table 1: Clinical-demographic and anatomic variables of patients undergoing TVE for bAVMs
Variables Patients (n = 57)
Sex (No.) (%)
 Male 29 (50.9%)
 Female 28 (49.1%)
Age (mean) (range) (yr) 38.05 ± 18.1 (9–78)
Previous rupture (No.) (%) 38 (66.6%)
bAVM location (No.) (%)
 Cortical (lobar or cerebellum) 41 (72%)
 Deep (brain stem, thalamus, or basal ganglia) 16 (28.0%)
Nidus diameter (original size) (mean) (cm) 2.91 ± 1.26
Nidus diameter before treatment by TVE (mean) (cm) 2.44 ± 0.99
Dilated vein (No.) (%)
 Evaluator 1 24 (42.1%)
 Evaluator 2 28 (49.1%)
 Evaluator 3 36 (63.1%)
Pattern of venous drainage (No.) (%)
 Superficial 25 (43.9%)
 Deep 28 (49.1%)
 Superficial and deep 4 (7.0%)
Venous collector (No.) (%)
 1 37 (64.9%)
 2 18 (31.6%)
 3 2 (3.5%)
Spetzler–Martin grade
 I 5 (8.8%)
 II 18 (31.6%)
 III 23 (40.4%)
 IV 10 (17.5%)
 V 1 (1.7%)

Variables	Patients (n = 57)
Sex (No.) (%)
Male	29 (50.9%)
Female	28 (49.1%)
Age (mean) (range) (yr)	38.05 ± 18.1 (9–78)
Previous rupture (No.) (%)	38 (66.6%)
bAVM location (No.) (%)
Cortical (lobar or cerebellum)	41 (72%)
Deep (brain stem, thalamus, or basal ganglia)	16 (28.0%)
Nidus diameter (original size) (mean) (cm)	2.91 ± 1.26
Nidus diameter before treatment by TVE (mean) (cm)	2.44 ± 0.99
Dilated vein (No.) (%)
Evaluator 1	24 (42.1%)
Evaluator 2	28 (49.1%)
Evaluator 3	36 (63.1%)
Pattern of venous drainage (No.) (%)
Superficial	25 (43.9%)
Deep	28 (49.1%)
Superficial and deep	4 (7.0%)
Venous collector (No.) (%)
1	37 (64.9%)
2	18 (31.6%)
3	2 (3.5%)
Spetzler–Martin grade
I	5 (8.8%)
II	18 (31.6%)
III	23 (40.4%)
IV	10 (17.5%)
V	1 (1.7%)