Abstract
Frontal sinus mucocele are benign, pseudocystic lesions that derive from the destruction of the sinus ostium, resulting in a continuous accumulation of mucus. The process of mucocele growth leads to a progressive enlargement of the sinus cavity, thickening and erosion of its bone walls until the invasion of surrounding tissues. Mucoceles are more common in the frontal sinuses, while involvement in the sphenoid, ethmoid and maxillary sinus is rare. The frontal sinus floor is divided by the upper orbital wall; thus, an early displacement of the orbit occurs in the growth of the frontal mucocele. This paper presents one of our experiences in endoscopic surgical management of frontal sinus mucopyocele with secondary orbital complications.