A unique epibulbar osseous choristoma

Epibulbar osseous choristoma within a dermolipoma: case report and literature review

A healthy 18-year-old girl presented with a superotemporal epibulbar mass that was present since birth. Computed tomography revealed a cystic mass with fat-like low-density and a central oval-shaped mass that was isodense to the bone in the superotemporal region of the globe. Histopathology of the excised tumour revealed osseous choristoma and dermolipoma. Our review of literature yielded nine reported cases of epibulbar osseous choristoma within a dermolipoma and we reviewed these cases.

A case of epibulbar osseous choristoma with review of literature

Epibulbar osseous choristomas are rare congenital simple choristomas consisting of pure bone on the sclera. It is usually recognized in childhood and most often located in the superotemporal quadrant. A case of 7-year-old male who presented with a history of mass in the left eye was reported in this paper. The mass had been present since birth but had showed slight enlargement during the last 6 months. Examination revealed a 7 × 5 mm reddish, hard, and mobile mass located in the superotemporal quadrant. Excisional biopsy was done. On histopathological examination, excised mass was found to be composed of mature bony trabeculae enclosing osteocytes, and diagnosis of epibulbar osseous choristoma was made.

Bilateral symmetrical epibulbar osseous choristoma

PURPOSE

To report a patient with bilateral symmetrical epibulbar osseous choristoma.

DESIGN

Retrospective observational case report.

PARTICIPANT

One patient with bilateral symmetrical epibulbar osseous choristoma.

METHOD

Retrospective review of stored office records, photographs, computed tomography (CT), and histopathological findings.

MAIN OUTCOME MEASURES

Appearance of the choristoma, CT, and histopathological findings.

RESULTS

A 6-year-old female had bilateral superotemporal subconjunctival masses. Surgical excision was performed bilaterally. The lesions were encapsulated and attached to the sclera, and consisted histopathologically of epibulbar osseous choristoma.

CONCLUSION

We report the first case of bilateral symmetrical epibulbar osseous choristoma without other associated choristomas. Preoperative CT imaging is helpful in assessing the extent of the tumor and planning surgery.

Bilateral ocular osseous choristomas

Choristoma is a benign tumour defined as normal tissue in an ectopic location. Osseous choristoma, one subtype of this entity, occurring within the orbit has rarely been reported in the world literature. We report a 6-year-old girl with bilateral ocular osseous choristomas who presented with palpable nodules protruding from both upper lids. The radiological and clinical findings are described and previous reports are reviewed.