Doctors are often able to diagnose acute sinusitis based on its characteristic symptoms, but this is not always the case with chronic sinusitis. Because symptoms of chronic sinusitis tend to be mild and vague, further testing is usually required to reach a diagnosis. If your doctor suspects that you have chronic sinusitis, he will probably order one or more of these tests:
Cultures of Sinus Drainage
In people with cystic fibrosis, several organisms are known to cause chronic sinusitis that may be found by culturing sinus drainage:
- Pseudomonas aeruginosa - common cause of chronic sinusitis in adults
- Staphylococcus aureus – common cause of chronic sinusitis in children
- Haemophilus influenza – common cause of chronic sinusitis in children
- Aspergillus fumigatus, and other fungi – common in all ages
Computed Tomography
A computed tomography (CT) scan is a type of x-ray that produces images of bone and soft tissues. CT scans are useful for diagnosing chronic sinusitis because the image shows the nose and the deepest parts of the sinuses, revealing inflammation, swelling, and infection that would not be seen on normal x-rays.
Nasal Endoscopy
Nasal endoscopy, also called rhinoscopy, is done by passing a flexible tube with a fiber-optic camera on the end of it through the nose and into the nasal passages. Endoscopy produces a real-time video image that allows the doctor to examine the nasal passage up close, and to obtain culture samples.
Source:
Robertson, J.M., Friedman, E.M., and Rubin, B.K. “Nasal and Sinus Disease in Cystic Fibrosis”. Paediatric Respiratory Reviews. 2008. 9:213–219. 2008 December 7.
