[Voluminous mucocele of frontal sinus with superior eyelid and orbit expansion].

Introduction: A mucocele is an unusual benign cystic tumor, frequently seen in the adult and affecting mucous sinuses that expand the orbit by bone destruction. It is caused by a lack of sinus aeration; surgical treatment consists in cyst extirpation and sinus drainage.

Description: A 72-year-old man, without a history of sinus disease, presented a voluminous mucocele of the right frontal sinus that had begun 3 years before, with superior eyelid and orbit expansion hiding and pushing the eye to the downside and the outside.