The paranasal sinuses are air-filled spaces and comprises of the maxillary sinuses, the ethmoid sinuses, the sphenoid sinuses and the frontal sinuses. As they are air-filled, tumours that arise in the paranasal sinuses often only present when they are large enough to obstruct the sinuses, or when they cause compressive symptoms on neighbouring structures (such as the orbit).
Various neoplasms ranging from benign to malignant tumours can arise in the paranasal sinuses. Fortunately, malignant neoplasms of the paranasal sinuses are uncommon and account for <1% of all neoplasms. Several more commonly seen neoplasms are listed in the table here:
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