Paranasal Sinus Mucoceles: Report of Cases in Four Different Localisations, Two of Which are Uncommon

Paranasal sinus mucoceles are relatively common, benign, slow growing cystic lesions filled with mucous or mucopurulent material that overfill the sinus. they are locally expansile and can cause bone destruction. these lesions are thought to be secondary to an obstruction of the sinus ostium caused by an inflammation, trauma, fibrosis, or previous surgery. they are frequently located in the frontal sinus and ethmoid sinuses, and are seen rarely in the maxillary and sphenoid sinuses. middle turbinate and septum mucoceles are seen very rarely. in this report we present a literature review and five cases of paranasal sinus mucocele in four different localisations, two of which are uncommon.