Hi, My son is being watching for Marfans. He has several of the criteria. He just turned 18. So far his heart looks good, (goes once a year), eyes good too. He just start getting many stretch marks all across his back. He complains of joint problems (pain) lately. Do you think the stretch marks is part of this syn drone? Even though his aorta looks good now, could he still have Marfans? Thanks so much!!