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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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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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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Radiographic Anatomy - Sinuses - Lateral

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Paranasal Sinus and Nasal Cavity Cancer Treatment (PDQ®)—Health Professional…

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