To present a unique case of ectopic orbital meningioma presenting in anteroinferior part of orbit.

Primary orbital meningiomas arise from the optic nerve sheath and constitute 10 to 30% of orbital meningiomas. Secondary orbital meningiomas represent 70 to 90% of orbital meningiomas and are the direct extension of intracranial meningiomas into the orbit. Rarely, ectopic rests of arachnoid cells give rise to meningiomas separate from optic nerve sheath. Ectopic orbit meningioma is a rare tumor arising from ectopic arachnoidal tissue. The present case report describes an elderly patient with ectopic orbital meningioma in anteroinferior quadrant.

A 70-year-old female patient presented with slowly growing mass in the inferior part of right orbit. This lesion was firm in consistency and not fixed to skin or bone. Computed tomography scan showed a homogeneous mass lesion in anteroinferior part of right orbit without any bony changes. The orbital mass was excised. Anatomic-pathologic evaluation of the excised specimen revealed a benign meningioma of a meningotheliomatous type.

Ectopic orbital meningioma may present in elderly patients in anteroinferior orbit.

An ectopic orbital meningioma should be considered in differential diagnosis of firm orbital mass presenting in anteroinferior orbit.

Gupta P, Kumar A, Moharana B, Vaiphei K, Ahuja C. Ectopic Inferior Orbital Meningioma. Clin Rhinol An Int J 2017;10(1):32-35.