• Am. J. Ophthalmol. · Jun 2002

    Case Reports

    Osseous choristoma of the conjunctiva simulating extraocular extension of retinoblastoma.

    • Eduardo F Marback, Timothy J Stout, and Narsing A Rao.
    • Doheny Eye Institute and the Department of Ophthalmology, Keck School of Medicine of the University of Southern California, Los Angeles, California, USA.
    • Am. J. Ophthalmol. 2002 Jun 1;133(6):825-7.

    PurposeTo report the clinicopathologic features of an epibulbar osseous choristoma simulating extraocular extension of retinoblastoma.DesignInterventional case report.MethodsA 7-month-old male presented with a unilateral intraocular mass localized to the temporal retina and a white pedunculated lesion extending from the conjunctiva, anterior to the insertion of the lateral rectus muscle. Clinical examination and computed tomography scan findings led to the diagnosis of retinoblastoma with extraocular extension. The child underwent excision of the epibulbar lesion and enucleation of the globe.ResultsThe histopathologic examination of the epibulbar lesion revealed an osseous choristoma. The intraocular contents displayed features typical of retinoblastoma without extraocular extension.ConclusionAn epibulbar osseous choristoma can simulate extraocular extension of retinoblastoma in an eye harboring the intraocular malignancy.

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