The para-nasal sinuses are air filled spaces in the bones of the skull, which connect to the nasal cavity. They are lined by specialized cells called mucosa. Sometimes the pathways that connect the sinuses to the nose become blocked and the mucosa becomes unhealthy. Pressure abnormalities can occur which cause pain. Sometimes these blocked sinuses become infected causing “acute” sinusitis with fever, severe facial pain and unpleasant mucous from the nose.
FESS stands for Functional Endoscopic Sinus Surgery. It is the modern approach to sinus surgery using endoscopes and minimally invasive techniques. The basic concept behind this surgery is to try and re-establish the natural ventilation pathways between the nasal cavity and the sinuses, and so improve the “function” of the nose. It also allows drugs in the form of nasal sprays, to penetrate further into the sinuses, which are opened to the inside of the nose.