Epibulbar osseous choristoma: a case report

Abstract

Peribulbar osseous choristoma is a benign, solid nodule; it is a subtype of epibulbar choristomas (belongs to single tissue choristomas), consisting of pure bony tissues. Epibulbar osseous choristoma is the rarest subtype of epibulbar choristomas, with only 65 cases reported since the mid-19th century; so, the rarity of the disease drove me to report it. A 7-year-old female presented with a painless left ocular superotemporal mass, which was present since birth and located under the conjunctiva. The primary diagnoses included lipodermoid and subconjunctival foreign bodies. Ocular interventions included a B-scan, examination under anesthesia and surgical excision of the mass in toto, and the histopathological examination showed that it was an osseous choristoma.

Keywords: choristoma; epibulbar.

Figure 1

Picture showing the subconjunctival mass with overlying dilated vessels.

Figure 2

(A) Picture showing the gross anatomy of this white osseus lesion during removal from the subconjunctival space; (B) histologically the lesion was composed of mature lamellated bone with Haversian system and may be surrounded by thin connective tissues capsule, rarely some may have bony trabeculae with marrow elements.