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In page Cardiothoracic surgery:

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A cardiac surgery residency typically comprises anywhere from four to six years (or longer) of training to become a fully qualified surgeon.[1] Cardiac surgery training may be combined with thoracic surgery and/or vascular surgery and called cardiovascular (CV) / cardiothoracic (CT) / cardiovascular thoracic (CVT) surgery. Cardiac surgeons may enter a cardiac surgery residency directly from medical school, or first complete a general surgery residency followed by a fellowship. Cardiac surgeons may further sub-specialize cardiac surgery by doing a fellowship in a variety of topics including pediatric cardiac surgery, cardiac transplantation, adult-acquired heart disease, weak heart issues, and many more problems in the heart.[citation needed]