Abstract
Tumors of the anterior skull base can arise from the frontal sinus, the ethmoid cells, the sphenoid sinus, and even from the maxillary sinus, from which they can spread toward the inside of the skull. Invasion may occur through the posterior wall or floor of the frontal sinus, the ethmoid roof, the cribriform plate, the planum sphenoidale, or the tuberculum sellae.
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