Different purposes: "myo" refers to muscle. A myotomy is an incision into a muscle such as might be done to cut an overly tight muscle between the esophagus and stomach. A myomectomy is the removal of a myoma which is a benign tumor composed of muscle cells that grows in the uterus. A myectomy refers to removing a overgrown muscle septum in the heart wall.
Answered 12/22/2018
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