Residual Draining

My son had 4 embo’s with Onyx about 8 years ago. Just received a call from family doc that results from a recent MRI show residual draining?? He has been referred to a specialist but any ideas of what that is?

Sounds a bit like they think I still have… The avm has practically gone but perhaps a tiny bit remains that still has a small amount of blood flowing through it . A recent MRI disclosed this They want me to have an angiogram to get a better look at mine… Best wishes. Grant