Mucocele of the sphenoidal sinus.

Mucocele of the sphenoidal sinus is a rare lesion often mistaken for a pituitary tumour. A case first misdiagnosed as pituitary tumour is described. Additional radiography including CT findings led to the correct diagnosis. The treatment of sphenoidal mucoceles is surgical. The sublabial trans-septal route has proved to be an excellent approach.