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Thendral Ponnudurai, Sophia Louisraj, Amjad Salman Cornea Department, Institute of Ophthalmology, Joseph Eye Hospital, Trichy, Tamilnadu, India Abstract: We present a case of a 15-year-old girl with an epibulbar osseous choristoma. The patient presented with a 3×3 mm, whitish, firm subconjunctival mass in the superotemporal quadrant of her right eye with vascularization. She underwent excision biopsy of the mass under topical anesthesia. The pathologic sections were consistent with a well-circumscribed osseous tissue without atypia. Osseous choristoma is one of the rare types of ocular choristoma to be considered in the differential diagnosis of pediatric epibulbar tumors. Keywords: epibulbar osseous choristoma, subconjunctival mass, excision biopsy

Purpose: To present the case of a 12-year-old female with an epibulbar osseous choristoma. Observations: The patient presented with right-sided conjunctival mass, which caused her discomfort. Slit lamp examination revealed a 5×5-mm, firm nodule in the superotemporal quadrant of the bulbar conjunctiva. The nodule had feeder vessels, adhered firmly to the sclera, and lacked signs of malignancy. The patient underwent excisional biopsy under general anesthesia. During this procedure, great care was taken to avoid perforation of the globe. The pathologic sections were significant for well-circumscribed osseous tissue without atypia. Conclusions and importance: We describe diagnosis and successful surgical management of osseous choristoma the rarest subtype of ocular choristoma. With only 65 cases reported since mid-19th century, the condition remains poorly described. This report provides additional information on diagnosis and treatment of this rare condition.