Chronic sinusitis

The sinuses are surrounded by bone and cartilage and lined with a mucous membrane. Sinusitis occurs when the membranes becomes inflammed and painful, which may be a result of a blocked sinus opening.
Chronic sinusitis is often caused by inflammation and blockage due to physical obstruction such as a deviated septum, misformed bone or cartilage structures such as the nasal conchae (turbinates), or blockage by nasal cysts or polyps.

Review Date: 8/5/2002 12:00:00 AM
Reviewed By:A.D.A.M. Medical Illustration Team

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