A Rare Case of an Intrasellar Arachnoid Cyst With Middle Cranial Fossa Extension

Intrasellar arachnoid cysts represent around 1% of all selar lesions. Generally, patients are asymptomatic and when they exhibit visual and/or hormonal disturbances, the indication for surgery is prompted. A 51-year-old woman with a known purely intrasellar cyst diagnosed 23 years prior to presentation, evolved gradual campimetric evaluation. Magnetic resonance imaging showed significant growth lesion, now extending into left middle fossa through cavernous sinus. The patient underwent fenestration via transsphenoidal approach. This first case in literature an cranial fossa.