Abstract
The paranasal sinuses are air-filled cavities, located inside the bones of the skull, with their ostia opening into the nasal cavity. The maxillary, ethmoid, sphenoid and frontal sinus, ethmoid sinus, and sphenoid sinus are named after the bone in which they are located. The anatomy of the paranasal sinuses is quite complex and prone to individual variation; however, basic surgical anatomy should be understood in order to avoid complications. The maxillary sinus is the largest paranasal sinus. Some variations of the maxillary sinus should be considered prior to surgery.
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