The incidence of the mucocele is lowest in: (A) Frontal sinus, (B) Sphenoid sinus, (C) Maxillary sinus, (D) Ethmoid sinus
Answer is B. Paranasal sinus mucoceles most commonly occur in the third or fouh decades of life with a slight male predilection. The frontal sinus is most commonly affected followed by the ethmoid sinuses, with repos suggesting 70-90 % of mucoceles occur in these locations.Ten percent of mucoceles occur in the maxillary sinus and the sphenoid sinus is involved rarely.