<prompt> A 80-year-old patient present with a midline tumor of the lower jaw, involving the alveolar margin. He is edentulous. Treatment of choice:HemimandibulectomyCommando operationSegmental mandibulectomyMarginal mandibulectomy  <response>: Surgery is the treatment of choice in mandible cancers. Radiotherapy is contraindicated as it can lead to osteoradionecrosis of mandible. Mandible is managed surgically by marginal or segmental resection. Marginal rim resection keeps the outerlower rim 1 cm thick mandible intact to maintain cosmesis. It is indicated when there is involvement of periosteum only or with minimal alveolarcoical involvement. Segmental resection removes a full segment of mandible creating a defect which necessitates reconstruction. 