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The optic nerve is an unusual site of schwannoma as it lacks Schwannoma cells on it. We report a primary optic sheath schwannoma and to review the literature. A 29-year old female presented with progressive painless non-pulsatile proptosis. Ocular examination revealed only axial proptosis. Imaging showed a well-defined intraconal mass abutting optic nerve. A left frontal craniotomy with orbitotomy and tumor excision was done. The tumor was well encapsulated, posteriorly attached to optic nerve without any plane, probable site of origin.