Table 4:

Characteristics of 34 AVMs

CharacteristicSummarya
Size of maximal dimension (mm) (n = 34)18.3 ± 5.3
Eloquent13/34 (38%)
Deep venous drainage5/31 (16%)
Spetzler-Martin score
    116/31 (52%)
    212/31 (39%)
    32/31 (6%)
    41/31 (3%)
    50/31 (0%)
Lobe
    Frontal14/34 (41%)
    Parietal5/34 (15%)
    Occipital4/34 (12%)
    Temporal5/34 (15%)
    Cerebellum2/34 (6%)
    Brain stem2/34 (6%)
    Thalamus/basal ganglia2/34 (6%)
Location
    Deep4/34 (12%)
    Subcortical5/34 (15%)
    Superficial25/34 (74%)
Nidus en passage (vs terminal)2/20 (10%)
Diffuse nidus (vs sharp)6/34 (18%)
Pial-to-pial collateralization5/31 (16%)
Moyamoya-type changes0/33 (0%)
Stenoses on arteries0/31 (0%)
Type, pial (vs choroidal)33/34 (97%)
Associated aneurysms0/30 (0%)
Multiple draining veins3/29 (10%)
Venous ectasia8/31 (26%)
Venous reflux1/29 (3%)
Pseudophlebitic pattern0/29 (0%)
  • a Summary is the No. of observations with specified value over the total No. (and the percentage) or the mean ± SD.