ABSTRACT
The mucocele of paranasal sinuses is a mucus-filled, epithelial-lined cystic structure resulting from the destruction of the sinus ostia secondary by recurrent inflammation, trauma or intrinsic disease. A 42-year-old man was presented with a left periorbital swelling that developed 7 days ago. CT scan revealed mass lesions with soft tissue density in the left anterior ethmoid and frontal sinus. MRI showed a well- demarcated cystic mass in the left anterior ethmoid sinus with a high signal on both the T1-weighted and T2-weighted images as well as in the left frontal sinus with a low signal on the T1-weighted images and a high signal on the T2- weighted images. The patient subsequently underwent the removal of the left anterior ethmoid and frontal mucocele via a Lynch's approach and a left endoscopic anterior ethmoidectomy. He has no recurrence 6 months after surgery.