Anterior clinoid mucocele coexisting with sphenoid sinus mucocele.

An anterior clinoid mucocele, known to be extremely rare, can lead to visual complications due to its proximity to the optic nerve. We report a patient who developed visual disturbance due to an anterior clinoid mucocele. Interestingly, the anterior clinoid mucocele coexisted with a sphenoid sinus mucocele. When an anterior clinoid mucocele coexists with a sphenoid sinus mucocele, more deliberate diagnostic and therapeutic approaches must be considered according to our first experience.