Orbital Retinoblastoma in an Adult.

Purpose: Retinoblastoma is usually seen in children before 5 years of age. We report an unusual case of retinoblastoma in an adult who presented to us with an orbital mass. Methods: A 24 year-old-male presented to our centre with a history of protrusion of the right eye for 6 months, and associated loss of vision. Ultrasonography B-scan revealed an intraocular mass with calcification and MRI of the orbits showed extra-ocular spread. An incisional biopsy was taken from the orbital mass. Results: On biopsy, histopathologic features and immunohistochemical stains were consistent with retinoblastoma. Conclusion: To our knowledge, this is the first report of retinoblastoma presenting as an orbital mass in adulthood and highlights the importance of considering this tumour in the differential diagnosis of an intraocular mass with orbital extension in an adult patient. [ABSTRACT FROM AUTHOR]