An MRI of the sinuses if there might be a tumor or fungal infection.A CT scan of the sinuses to help diagnose sinusitis or view the bones and tissues of the sinuses more closely.Imaging tests that may be used to decide on treatment are: This is often done by doctors who specialize in ear, nose, and throat problems (ENTs). The provider may view the sinuses through a fiberoptic scope (called nasal endoscopy or rhinoscopy) to diagnose sinusitis. Tapping over a sinus area to find infection.Shining a light against the sinus (transillumination) for signs of inflammation.Looking in the nose for signs of polyps.The health care provider will examine you or your child for sinusitis by: ![]() Weakened immune system from HIV or chemotherapy.Changes in altitude (flying or scuba diving).Diseases that prevent the cilia from working properly.The following may increase the risk that an adult or child will develop sinusitis: Subacute sinusitis is when the symptoms and swelling is present from 1 to 3 months.It may be caused by bacteria or a fungus. Chronic sinusitis is when the symptoms and swelling of the sinuses is present for longer than 3 months.It is caused by bacteria growing in the sinuses. Acute sinusitis is when symptoms are present for 4 weeks or less.Chronic infection can cause mucosal swelling and inflammation.A deviated nasal septum, nasal bone spur, or nasal polyps may block the opening of the sinuses. ![]() Colds and allergies may cause too much mucus to be made or block the opening of the sinuses.This may be due to some medical conditions. Small hairs (cilia) in the sinuses fail to properly move mucus out.Sinusitis can occur from one of these conditions: ![]() When the sinus openings become blocked or too much mucus builds up, bacteria and other germs can grow more easily. Most of the time, mucus is able to drain out and air is able to flow through the sinuses. Healthy sinuses contain no bacteria or other germs. They are located behind the forehead, nasal bones, cheeks, and eyes. The sinuses are air-filled spaces in the skull.
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