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Meningioma of the Frontal Sinus

Meningioma of the frontal sinus is a rare entity. Only nine cases of primary frontal sinus meningioma are reported in the literature. Two cases of frontal sinus meningioma, one primary and one secondary, are herein described. Each patient presented with headache and a frontal mass. Neither patient had fever or signs of meningeal irritation. Computerized tomography (CT) of the paranasal sinuses demonstrated frontal sinus opacification, posterior table bone erosion, and inferolateral displacement of the orbital contents in both patients. One patient underwent preoperative magnetic resonance imaging (MRI) that was officially interpreted as a frontal sinus mucocele and a small epidural abscess. Patients underwent unsuccessful endoscopic decompression for presumed mucoceles. Subsequent MRI in the second patient showed a large intracranial mass with extension into the frontal sinus. Treatment included frontal sinus obliteration and frontal craniotomy for removal of tumor, respectively. Meningioma was confirmed histologically in each patient. Although meningioma of the frontal sinus is rare, thorough evaluation, including MRI, should be considered for frontal sinus opacification in association with posterior table bone erosion.