Characteristics of AVM based on MRA studies (concordant with CCA)
| No. | Location of AVM | MRA Findings | CCA | |||
|---|---|---|---|---|---|---|
| Feeding Artery | Venous Drainage | Nidus Diameters (cm) | Nidus configuration | Nidus Diameters (cm) | ||
| 1 | Left parietal-occipital | MCA 2 | SSS | 13.5 × 2.5 × 1.75 | Compact | 11.5 × 2.7 × 1.5 |
| 2 | Right occipital | PCA | Straight S and SSS | 1.9 × 1.5 × 2.7 | Diffuse | 1.9 × 1.6 × -‡ |
| 3 | Left temporal | PCA and MCA 2 | Galen vein and SSS | 4.9 × 5.2 × 6.0 | Compact | 4.5 × 5.2 × 6.2 |
| 4 | Left posterior fossa AVF | Left external carotid (occipital branch and posterior auricular) | LSS | No nidus | No nidus | No nidus |
| 5 | Right parietal AVM | MCA 1 | SSS | 2.07 × 1.5 × 2.29 | Compact | 2.25 × 1.66 × 2.11 |
| 6 | Cervical AVM (C2–C5) | Left subclavian | Ant. spinal V | 4.8 × 1.8 × 0.7 | Diffuse | 4.9 × 1.8 × 0.7 |
| 7 | Cervical AVM (C2–C5) | Right vertebral and ASA | RSS, straight S, and SSS | 3.6 × 1.2 × 2 | Compact | 3.45 × 1.6 × 1.84 |
| 8 | Cervical AVM (C1–C2) | ASA | Galen vein | 1.1 × 1.1 × 2.0 | Compact | 1.6 × 0.8 × 1.6 |
Note:—PCA indicates posterior cerebral artery; ASA, anterior spinal artery; straight S, straight sinus; SSS, superior saggital sinus; LSS, left sigmoid sinus; Ant. spinal V, anterior spinal vein; RSS, right sigmoid sinus; AVF, arteriovenous fistula; AVM, arteriovenous malformation; MCA, middle cerebral artery. No residual AVM was detected after treatment on both MRA and CCA for patients 9 and 10.