What Is Cancer of the Paranasal Sinus and Nasal Cavity?

Cancer of the paranasal sinus and nasal cavity, also known as nose cancer or sinus cancer, is a disease in which cancer (malignant) cells are found in the tissues of the paranasal sinuses or nasal cavity. The paranasal sinuses are small hollow spaces around the nose. The sinuses are lined with cells that make mucus, which keeps the nose from drying out; the sinuses are also a space through which the voice can echo to make sounds when a person talks or sings. The nasal cavity is the passageway just behind the nose through which air passes on the way to the throat during breathing. The area inside the nose is called the nasal vestibule.

There are several paranasal sinuses, including the frontal sinuses above the nose, the maxillary sinuses in the upper part of either side of the upper jawbone, the ethmoid sinuses just behind either side of the upper nose, and the sphenoid sinus behind the ethmoid sinus in the center of the skull.

Cancer of the paranasal sinus and nasal cavity most commonly starts in the cells that line the oropharynx. Much less often, cancer of the paranasal sinus and nasal cavity starts in the color-making cells called melanocytes, and is called a melanoma. If the cancer starts in the muscle or connecting tissue, it is called a sarcoma. Another type of cancer that can occur here, but grows more slowly, is called an inverting papilloma. Cancers called midline granulomas may also occur in the paranasal sinuses or nasal cavity, and they cause the tissue around them to break down.