[gchappel]

At this point, the real question is -- is it changing his life style?
What type of MRI, knee or mra of the legs?
I will say I am a radiologist- and when you are a hammer everything looks like a nail, but if this is significantly changing his lifestyle I would make an appointment with a vascular interventionalist- be it a rad or surgeon, and make sure it is not a plumbing problem they can fix.
Gary