Table 3:

Univariate analysis showing the association between findings on HC and the clinical-anatomic-demographic variables of patients treated by TVE

VariableWere There HC?
No (n = 49)Yes (n = 8)P
Spetzler-Martin grading system1.0a
 I, II, and III39 (68.5%)7
 IV and V10 (17.5%)1
Previous rupture1.0a
 No163
 Yes335
Sex.70a
 Female253
 Male245
Mean age on admission (SD) (yr)37.1 (18.6)46.8 (13.6).16b
No. of venous collectors (mean) (SD)1.2 (0.45)2.0 (0.75).003c
Presence of dilated draining vein (No.) (%).06a
 Evaluator 1 = 24/5718 (31.5%)6 (10.5%)
Presence of dilated draining vein (No.) (%).14a
 Evaluator 2 = 28/5722 (38.5%)6 (10.5%)
Presence of dilated draining vein (No.) (%).69a
 Evaluator 3 = 36/5730 (52.6%)6 (10.5%)
Pattern of venous drainage.48a
 Superficial214
 Deep253
 Superficial and deep31
Nidus diameter before any intervention.01b
  (mean) (SD) (cm)2.74 (1.19)3.88 (1.40)
Nidus diameter before TVE (mean) (SD) (cm)2.28 (0.92)3.37 (1.00).003b
Nidus diameter before TVE (2 groups).03a
 0–3 cm383
 >3 cm115
AVM location.09a
 Cortical (lobar or cerebellum)338
 Deep (brain stem, thalamus, or basal ganglia)160
  • a Fisher exact test.

  • b Student t test.

  • c Mann-Whitney test.