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Segmentectomy is the excision (removal) of a portion of any organ or gland. The procedure has several variations and many names, including segmental resection, wide excision, lumpectomy, tumorectomy, quadrantectomy, and partial mastectomy.
A colectomy is a surgical procedure in which all or part of the large intestine is resected. The large intestine is the part of the alimentary tract that consists of the cecum, the ascending colon, the transverse colon, the descending colon, the sigmoid colon, and the rectum.