They map your liver about 30 days before the treatment I have tumors on both sides so 2 treatments are done about a month apart. They go up the artery in your groin and drop about a teaspoon size of y-90 microscopic glass spheres that actually number about a million. These guys lodge near the tumors and kill or shrink them. Treatment itself isn’t too bad although not fun? Best part for me I finally had something work to shrink my many tumors. Gastrin level has dropped the 250 level from 2000 it was done in August 2022 still stable! Unfortunately I had rare side effects I had radiation gastric ulcer 1 bead got loose and recovery was rough anything that went down hurt had to go back on a feeding tube for a couple months and also have a kidney that no longer functions. I hope I didn’t scare anyone my side effects are rare I would do it again if it was recommended.