Diseases of PNS
Mucocele is commonly seen in sinus: [AIIMS Nov 2011]
A mucocele is an epithelial lined, mucus containing sac completely filling the sinus and capable of expansion:
a. Mucocele are most commonly formed in Frontal sinus followed by ethmoid, sphenoid and maxillary sinuses.
b. Mucocele of frontal sinus presents as a swelling in the floor of frontal sinus above the inner (medial) canthus. It displaces the eyeball forward, downward and laterally.
IOC = CTscan
TOC = Endoscopic sinus surgery
According to Dhingra, 6th/ed p 198
a. Least common sinus assopciated with Mucocele formation is sphenoid.
b. But Scott Brown 7th/ed Vol 2 p 1531 says:
Most of the cases of mucocele of sphenoid sinus are referred to neurosurgeons. Therefore, it seems it is less common but actually the sinus least involved by mucocele is maxilla.