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.
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
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.