Master of Surgery
（重定向自MChir）
The Master of Surgery (Latin: Magister Chirurgiae) is an advanced qualification in surgery. Depending upon the degree, it may be abbreviated Ch.M., M.Ch., M.Chir. or M.S. At a typical medical school the program lasts between two and three years. The possession of a medical degree is a prerequisite. The Ch.M. can be awarded on both clinical and academic competency or on academic competency. The regulations may ask for surgical experience and a thesis topic that is not purely medical, but otherwise there is little to distinguish the ChM from the MD.