Growing Pains vs. Cancer: Why You Should Take Your Kid’s Knee Pain Seriously 05/19/2014 majac Your Health Matters Osteosarcoma is a very malignant process. It spreads fast and can have severe consequences. While the management of osteosarcoma is improving, this cancer — if not caught in time — often requires radical intervention to save the child's life. Share on FacebookTweetFollow usSave