Lateral orbitotomy for removal of sphenoid wing meningiomas invading the orbit.

OBJECTIVE: This study defines the indications, results, and limits of lateral orbitotomy coupled with resection of the sphenoid wing for removing lateral sphenoid wing meningiomas with intraorbital extension.

METHODS: Eighteen patients with lateral sphenoid wing meningiomas and tumor extension into the lateral or superolateral compartments of the orbital cavity were treated by microsurgical lateral orbitotomy and resection of the sphenoid wing without craniotomy. The approach consisted of a linear skin incision along the upper eyelid crease extending to 2 cm from the canthal angle and resection of the lateral orbital rim, lateral orbital wall, and infiltrated sphenoid wing.

RESULTS: A complete resection (Simpson I), including the infiltrated bone, dura, and periorbita, was obtained in 13 patients (72%); in the other 5 cases (28%), the tumor mass and most infiltrated dura were removed, but the entity of dural resection up to the normal tissue could not be exactly defined (Simpson II). Follow-up ranged from 5 to 17 years (mean 9.7 years).

CONCLUSION: A select group of lateral sphenoid wing meningiomas with tumor extension in the lateral or superolateral compartments of the orbital cavity may be successfully approached and removed through a lateral orbitotomy with resection of the sphenoid wing and without craniotomy. Cases with tumor extension to the anterior clinoid process and superior orbital fissure and those with extension medial to the axis of the optic nerve require a transcranial approach.