AVM and AVF characteristics | DSA |
---|---|
Pial AVMs diagnosed | Â |
 Total | 18 |
 Cerebellum | 17 (94.4) |
 Brainstem | 1 (5.5) |
Size of nidus | Â |
 < 3 cm | 10 (55.6) |
 3–6 cm | 7 (38.9) |
 > 6 cm | 1 (5.6) |
Total no. of arterial feeders | Â |
 Posterior circulation | 30 |
 Anterior circulation | 1 |
Dural supply | 0 |
Intranidal aneurysm | 3 (16.7) |
Flow-related aneurysms | Â |
 Total | 19 (50) |
 Feeder vessel | 18 (44.4) |
 Draining vein | 1 (5.6) |
Dural AVFs diagnosed | Â |
 Total | 11 |
 Transverse-sigmoid junction | 7 (63.7) |
 Torcular | 3 (27.3) |
 Petrosal | 1 (9.1) |
Cognard classification [8] | Â |
 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 | Â |
 Posterior circulation | 9 |
 Anterior circulation | 12 |