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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.
Diskectomy is the most common surgery used for herniated disk in the lumbar region. In this procedure, the portion of the disk that is causing the pressure on your nerve root is removed. In some cases, the entire disk is removed. The surgeon will access the disk through an incision in your back (or neck).