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Anterior (A) and lateral (B) views of the paranasal sinuses. C. Coronal section of the skull revealing the cranial, orbital, and nasal cavities and their relationships to the paranasal sinuses

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Anatomy of the paranasal sinuses; drawing shows front and side views of the frontal sinus, ethmoid sinus, maxillary sinus, and sphenoid sinus. The nasal cavity and pharynx (throat) are also shown.

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A CT scan of the face produces images that also show a patient's paranasal sinus cavities. The paranasal sinuses are hollow, air-filled spaces located within the bones of the face and surrounding the nasal cavity, a system of air channels connecting the nose with the back of the throat. There are four pairs of sinuses, each connected to the nasal cavity by small openings. View this four minute video, courtesy of the American College of Radiology.

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Involvement of the nasal cavity and paranasal sinuses by IgG4-related disease is rare and is usually found in association with multiorgan lesions. Mikulicz disease- diffuse mucosal thickening of the nasal cavity and paranasal sinuses –“Biopsy revealed IgG4-related sclerosing disease.”

Learn more about Paranasal Sinus and Nasal Cavity Cancer Treatment (PDQ®) (Patients) from the National Cancer Institute at Siteman Cancer Center.

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