Bart Claassen

Retention cysts of paranasal sinuses are common benign lesions usually discovered incidentally on a plain sinus radiograph or cross-sectional imaging of the head. They do not usually cause symptoms. They are also referred to as mucous retention cysts. It is difficult to estimate their true incidence since most studies report findings of retention cysts on imaging performed for unrelated symptoms. However, an incidence of 29-31% has been reported in studies on adults undergoing brain MRI 3,4.

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