MRI for preoperative planning of a sphenoid sinus mucocele/fluid filled lesion to sinus near artery with boney erosion. There is a globular T2 hyperintense and T1 hypointense lesion with thin peripheral mucosal enhancement that completely occupies the left sphenoid sinus and measures up to 25 mm. The walls of the left sphenoid sinus are diffusely thinned. The other paranasal sinuses and intracranial structures are unremarkable.
Findings suggestive of left sphenoid sinus mucocele formation.