Abstract
Localized orbital amyloidosis is a rare clinical entity. Periocular and orbital amyloid deposits are mainly located at the lacrimal apparatus, eyelid, conjunctiva, ocular adnexa, extraocular muscles, and levator palpebrae muscle. In this article, we report an unusual case of optic nerve amyloid deposition in an 82-year-old African American woman who presented with vertical diplopia. MRI revealed an enhancing mass from the optic nerve sheath, and CT showed foci of calcifications suggestive of optic nerve meningioma. However, an incisional biopsy demonstrated lymphoproliferative disease with focal optic nerve sheath amyloid deposition confirmed by histologic Congo red staining and immunohistochemistry.
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