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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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from Harvard Health

What to do about sinusitis

What to do about #sinus - If you've ever had a cold that just wouldn't go away, chances are it was #sinusitis, an inflammation of the paranasal sinuses, the cavities within the bones that surround the nose. The sinuses are lined with a thin membrane that produces mucus, which normally drains through small openings into the nasal cavity. Sinusitis starts when this drainage system becomes blocked. Soon your head hurts, you feel facial pressure or pain, and thick mucus clogs your nose.

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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.”