The world was surprised, impressed, and -- perhaps most importantly -- informed by Angelina Jolie's announcement Monday night that she had a preventative double mastectomy. The Oscar-winning actress announced that she decided to have the procedure in order to reduce her high genetic chances of developing breast or ovarian cancer. "omg! Insider" caught up with CNN's Senior Medical Correspondent Elizabeth Cohen to find out some of the answers to the most pressing medical questions that arose following Jolie's announcement. For the latest entertainment news, check out "omg! Insider" on TV.