Bilateral involvement of frontoethmoidal sinuses with orbital extension; An extremely rare manifestation of mucocele: case report. Objectives: Bilateral frontoethmoidal mucocele with orbital extension is a rare lesion which can imitate bilateral medial canthus masses. Its timely diagnosis and surgical interventions prevent further complications such as intracranial and nasal extensions. Case report: A 32 year-old male was referred to our clinic with complaint of epiphora and continuous headache lasting one year. CT scan depicted bilateral hypodense masses in frontoethmoidal sinuses and bone erosion on medial wall of right orbital cavity. In his surgical history, there was an endoscopic sinus surgery for chronic sinusitis 4 years ago. This document as one of the predisposing factors of mucocele led us to consider mucocele as the most likely diagnosis. Therefore, he underwent endoscopic sinus surgery at doctor’s discretion. Preoperative problems disappeared 3 months after surgery. And no recurrence has been observed up to now. Conclusion: Although bilateral frontoethmoidal sinus mucoceles are rare, however, they should be considered in such similar cases and immediate interventions should be made.
