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Chronic sinusitis refers to ongoing long-term sinus infection-inflammation that often develops secondary to a prolonged/refractory acute sinus infection.
It most commonly affects young to middle-aged adults but can uncommonly also affect children.
Chronic sinusitis is defined clinically as a sinonasal infection lasting more than 12 weeks. Patients may present with symptoms of sinusitis such as nasal obstruction, nasal discharge, facial pain, headache, halitosis, anosmia, etc. It is important to note however that diagnosis of chronic rhinosinusitis requires at least either nasal congestion or discharge, in the absence of both other causes should be explored 14.
It is worth noting that there is a poor correlation between symptoms and imaging findings of chronic sinusitis and that endoscopically diagnosed chronic sinusitis may lack imaging correlation as the mucosa is best appreciated on endoscopy 11.
paranasal sinus anatomical variants obstructing drainage (see below)
A study was done on 150 patients of chronic rhinosinusitis and found the following anatomical variants 10:
concha bullosa (30%)
posterior nasal septal deviations (25%)
uncinate process variations (25%)
agger nasi cells (10%)
Haller cells (9%)
A characteristic feature on CT sinuses is sclerotic thickened bone (hyperostosis) involving the sinus wall from a prolonged mucoperiosteal reaction. Intrasinus calcification may be present. The presence of opacification is not a good discriminator from an acute sinus infection.
There are five main patterns of chronic inflammatory disease that classify the disease into distinct anatomical/pathological groups and are dependant on the drainage pathways affected. This classification helps the surgeon to select the type of surgery needed 12:
ostiomeatal complex (OMC) pattern: maxillary sinus, anterior ethmoid air cells, and frontal sinuses are affected due to obstruction of the ostiomeatal complex
infundibular pattern: isolated obstruction to the ethmoid infundibulum and/or maxillary sinus ostium
sphenoethmoidal recess pattern: inflammatory changes in the sphenoethmoidal recess obstruct the sphenoid sinus in isolation or in conjunction with the posterior ethmoidal air cells
sinonasal polyposis pattern: extensive polyps are occupying the nasal cavity and the paranasal sinuses
sporadic pattern: no clear pattern could be identified with random mucosal thickening, polyps
Treatment and prognosis
Functional endoscopic sinus surgery (FESS) has revolutionised the approach and treatment of chronic rhinosinusitis. Certain anatomical variations are thought to be predisposing factors for the development of sinus disease and it is necessary for the surgeon to be aware of these variations, especially if the patient is a candidate for FESS 10.