Hello! I have had MSK for 11 years now. Has anyone found any information about MSK other than word-of-mouth info from urologists, radiologists, etc.? I know that CT scans will show the smaller stones that IVP's may not. There is a website called "The Kidney Stone Web Site" which is excellent in explaining all about kidneys and stones, however, no info on MSK. Also, if you haven't already used a heating pad or hot bath when you're having that back pain, please try it! It helps with mild to moderate pain but nothing helps with severe pain except passing that stone! Please respond if you know of a website explaining Medullary Sponge Kidneys. Thank you.