Saturday night, my kids spent the night at my mom's. My 3 yr old, Braden, woke up and couldn't sleep. My mom was rubbing his leg to try to get him back to sleep and felt a knot on the back of his right knee. It looks like a goose egg. So far, it's not causing him any pain. We took him to his pediatrician who was concerned and not sure what it was. She consulted a pediatric oncologist at a larger hospital and they have decided to do an MRI with sedation. I take him for the MRI on Sept. 10th. I think this is the most worried and scared I've been in my life. I've been a nurse for 10 years...and 8 of those I worked on a pediatric unit. Sometimes I think too much knowledge of everything this could be makes it so much worse. Please keep my lil angel in your prayers. I will update when I know more. Thank you all and God Bless!