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Spinal AVM classification

Dr Yuranga Weerakkody and Dr Frank Gaillard et al.

Spinal arteriovenous malformations can be classified in a number of ways:

intramedullary :
extramedullary : 80% ¹

Or into four types ²:

type I : single coiled vessel (dural AV fistula)
type II : intramedullary glomus AVM
type III : juvenile
type IV : intradural perimedullary (AV fistula)
- sub type I : single arterial supply (ASA), single small fistula, slow ascending perimedullary venous drainage
- sub type II : multiple arterial supply (ASA and PSA), multiple medium fistulae, slow ascending perimedullary venous drainage
- sub type III : multiple arterial supply (ASA and PSA), single giant fistula, large ectatic venous drainage