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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.
Discectomy is the removal of the disc (and any fragments) between the vertebrae that are to be fused. When symptoms are coming from the disc, it is hoped that this stops the symptoms. Related Document: A Patient's Guide to Cervical Discectomy.