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Table 1 Demographics and characteristics of 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 No. of patients
M/F (ratio) 29:13
Mean age in yrs (range) 26.0 (6–47)
Side (L/R) 21:21
AVM size  
 <3 cm 11
 ≥3 cm, <6 cm 28
 ≥6 cm 3
Venous drainage  
 Superficial 28
 Deep 14
Diffuseness  
 Compact 24
 Diffuse 18
Spetzler-Martin grade  
 I 2
 II 19
 III 14
 IV 7
 V 0
AVM-OR  
 <5 mm 34
 ≥5 mm 8
AVM-VC  
 <5 mm 17
 ≥5 mm 25
History  
 Hemorrhage 15
 Headache 16
 Seizure 9
 Dizziness 2
VF  
 Grade 0 28
 Grade 1 8
 Grade 2 2
 Grade 3 4
 Grade 4 0
  1. AVM-OR distance from AVM to optic radiation, AVM-VC distance from AVM to visual cortex, F female, L/R left/right, M male, No. number, VF visual field, yrs years