Air-fluid levels and mild mucosal thickening is only indicative with a relevant history. Usually a viral aetiology. Complications of sinusitis include polyps, mucous retention cyst and mucocele.

•  Opacification of the sinus/mucosal thickening.
•  Sinus expands and bone remodels (bony wall may thin due to pressure necrosis).
•  Peripheral enhancement.
•  Complete absence of air in the sinus represents a mucocele.
•  If there is some air in the sinus, it may represent a mucous retention cyst (difficult to distinguish from a polyp).


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