Chinese doctors from People's Hospital of Jilin successfully performed an open heart surgery on a nine-month-old baby suffering from Congenital Heart Defect called a Total Pulmonary Venous Anomalous Drainage, using a 3D printed heart model to plan the surgery. A full-sized heart replica modeled the boy's cardiac structure which assisted for virtual surgery.
Source: http://news.xinhuanet.com/english/2016-03/17/c_135197788.htm