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Classification of spinal extradural AVFs reported by Rangel-Castilla (2011)
| Types of AV shunts | Subtype | Venous drainage, neurological deficit |
|---|---|---|
| Extradural AVF | A | w intradural venous drainage |
| B1 | w/o intradural venous drainage, w neurological deficits | |
| B2 | w/o intradural venous drainage, w/o neurological deficits |
