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Table 2 VF evaluation in the 42 patients with occipital AVMs

From: Involvement of the visual pathway is not a risk factor of visual field deficits in patients with occipital arteriovenous malformations: an fMRI study

Parameters Normal VFs VFDs P value
Gender (n)    0.729
 M 20 9  
 F 8 5  
Age (ys) 26.6 ± 9.9 24.8 ± 14.3 0.674
Side (n)    0.744
 Left 13 8  
 Right 15 6  
Size (mm) 39.8 ± 12.8 38.6 ± 13.4 0.787
Size    1.000
 <3 cm (n) 7 4  
 ≥3 cm (n) 21 10  
Venous drainage (n)    0.165
 Superficial 21 7  
 Deep 7 7  
Diffuseness (n)    0.742
 Compact 15 9  
 Diffuse 13 5  
S-M grade 2.7 ± 0.8 2.5 ± 0.9 0.515
AVM-OR (mm) 2.9 ± 3.9 2.4 ± 2.7 0.640
AVM-OR    1.000
 <5 mm (n) 23 11  
 ≥5 mm (n) 5 3  
AVM-VC (mm) 7.8 ± 9.4 11.3 ± 7.2 0.238
 AVM-VC    0.102
 <5 mm (n) 14 3  
 ≥5 mm (n) 14 11  
History of hemorrhage    0.000003
 Ruptured 3 12  
 Unruptured 25 2  
Chronic headache    0.042
 Yes 14 2  
 No 14 12  
Seizure    0.017
 Yes 9 0  
 No 19 14  
  1. AVM-OR distance from AVM to optic radiation, AVM-VC distance from AVM to visual cortex, F female, M male, VFDs visual field deficits, VFs visual fields, ys years