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Table 2 Characteristics of AVM and dAVF in our study

From: Angiographic analysis on posterior fossa hemorrhages and vascular malformations beyond aneurysms by CT angiography and digital subtraction angiography

AVM and AVF characteristics

DSA

Pial AVMs diagnosed

 

 Total

18

 Cerebellum

17 (94.4)

 Brainstem

1 (5.5)

Size of nidus

 

 < 3 cm

10 (55.6)

 3–6 cm

7 (38.9)

 > 6 cm

1 (5.6)

Total no. of arterial feeders

 

 Posterior circulation

30

 Anterior circulation

1

Dural supply

0

Intranidal aneurysm

3 (16.7)

Flow-related aneurysms

 

 Total

19 (50)

 Feeder vessel

18 (44.4)

 Draining vein

1 (5.6)

Dural AVFs diagnosed

 

 Total

11

 Transverse-sigmoid junction

7 (63.7)

 Torcular

3 (27.3)

 Petrosal

1 (9.1)

Cognard classification [8]

 

 I—Antegrade sinusoidal flow

2 (18.2)

 IIa—Reflux sinusoidal

0 (0)

 IIb—Reflux sinusoidal

3 (27.3)

 III—Direct shunt into cortical vein

1 (9.1)

 IV—As III with venous ectasia

1 (9.1)

 V—Perimedullary venous drainage

4 (36.4)

Total no. of ECA feeders

27

No. of other arterial feeders

 

 Posterior circulation

9

 Anterior circulation

12