Osseous choristoma of the conjunctiva simulating extraocular extension of retinoblastoma.
OBJECTIVE
To report the clinicopathologic features of an epibulbar osseous choristoma simulating extraocular extension of retinoblastoma.


METHODS
Interventional case report.


METHODS
A 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.


RESULTS
The histopathologic examination of the epibulbar lesion revealed an osseous choristoma. The intraocular contents displayed features typical of retinoblastoma without extraocular extension.


CONCLUSIONS
An epibulbar osseous choristoma can simulate extraocular extension of retinoblastoma in an eye harboring the intraocular malignancy.
Marback
Eduardo F
EF
Doheny Eye Institute and the Department of Ophthalmology, Keck School of Medicine of the University of Southern California, Los Angeles, California, USA.
Stout
Timothy J
TJ
Rao
Narsing A
NA
D001842:Bone and Bones; D002828:Choristoma / Q000175:diagnosis*; D003229:Conjunctival Diseases / Q000175:diagnosis*; D003937:Diagnosis, Differential; D015353:Eye Enucleation; D006801:Humans; D007223:Infant; D008297:Male; D019572:Retinal Neoplasms / Q000175:diagnosis*; D012175:Retinoblastoma / Q000175:diagnosis*; D014057:Tomography, X-Ray Computed