Primary intraorbital meningioma with intraocular extension.

Intraocular invasion of a meningioma primary in the sheath of the intraorbital portion of the optic nerve was noted in a 54-year-old woman with a 16-year history of visual loss. Seventeen additional cases of intraglobal extension of intraorbital meningioma were found in the literature. The clinical features and histopathologic findings of the total cases are compared and reviewed. We suggest that the mode of penetration is along the course of the posterior ciliary vessels as they penetrate the sclera.