Frontal sinus mucocele
Headache and frontal swelling.
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Expansion and total opacification of the left frontal sinus with T1 high-intensity fluid content and smooth scalloping of its related bony bounderies, resulting in a focal bony defect of the anterior wall of the frontal sinus through which minimal extension into adjacent soft tissue / subgaleal region is noted.
Mucocele of paranasal sinuses is an airless, expanded sinus that develops after obstruction of the sinus ostium, or rarely after filling of the sinus by a distended mucous gland, and contained mucoid secretions produced by the mucosal lining. The extreme differences in MR signal intensity reflect variable hydration of the mucoid contents of the obstructed sinus.