SDN Members don't see this ad. (About Ads) The CREST study shows that surgery is better than stenting. The SAMMPRIS trial stops enrollment because there were too many strokes in the interventional wing. The more acute stroke cases that go to interventional, the more M&M. This leaves diagnostics (but CTA gets better and better) aneurysms (pretty common), AVMs (rare), tumors (potentially common if IA therapy turns out to be beneficial), and nosebleeds.