Sphenoethmoid mucocele with intracranial extension: Radiologic diagnosis

Mucoceles of the frontal, maxillary, and anterior ethmoid sinuses are relatively common, but those that arise in the sphenoid and posterior ethmoid sinuses are rare. Intracranial extension of sphenoethmoid sinus mucoceles is extremely rare, and can be confused with other intracranial disease processes. We present a patient with a large sphenoethmoid sinus mucocele with intracranial extension. Computerized tomography (CT) and magnetic resonance imaging (MRI) were crucial in the preoperative evaluation.