1) Pial AVM
This is mostly a pial AVM with a dural component (mixed AVM)
Q: What is the Spetzler-Martin grading system, what is it used for?
A: Published in 1986, it determines the risk of (open) surgical treatment.Â
References:
Summary
http://radiopaedia.org/articles/spetzler-martin-avm-grading-system
Original article