I just wanted to say thank you to everyone who has responded so far. It feels good to know that there are others out there. After episodes of severe swelling in his right arm along with it turning a horrible shade of blue/purple and many doctors, we finally received a diagnosis from a local doctor and a recommendation for Dr. Freischlag from Penn State Hershey Med Center. Dr. F. found he has malformed first ribs on both sides. She believes that only the right one needs to be removed, as it is the only one giving him trouble. It has been a really trying last few months. He has severe pain in his arm and has had to give up his one love, competitive swimming. Dr. F believes he will be able to compete after surgery and recovery, but it is very difficult dealing with this in my 10 year old son. He was very depressed and we were all terrified of blood clots, etc. Thank you for everything. I'll be sure to keep you up to date.