Chondrosarcomas are malignant mesenchymal tumors of chondroid nature. Less than 5% of all chondrosarcomas are localized in the head and neck. The paper analyzes a case of extensive chondrosarcoma of the skill base, which involves the anterior and median cranial fossa, ethmoidal, sphenoidal, right maxillary sinuses, and intratemporal fossa. A basal approach that is a combination of two-flapped subfrontal and orbitozygomatous accesses was used to remove the tumor. In doing so, the tumor could be excised and extensive defects of the skull base could be effectively closed with the flaps of the periostium and musculus temporalis, yielding a good functional and cosmetic effect.
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