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Epibulbar Complex Choristoma Containing Bone: A Case Report and Closer Look at Classifications.
Zachary George Angus1,2, Penelope McKelvie3, Thomas G Hardy1,4
1Department of Ophthalmology, Royal Victorian Eye and Ear Hospital, Melbourne, VIC, Australia.
Case Reports in Ophthalmology
|May 9, 2024
Summary
Epibulbar choristomas are benign growths; a case initially thought to be a dermolipoma was histologically confirmed as a complex choristoma with unexpected ossification. This finding does not alter current management strategies for these congenital eye lesions.
Area of Science:
- Ophthalmology
- Pathology
- Congenital Abnormalities
Background:
- Epibulbar choristomas are benign congenital lesions composed of normal tissue in an abnormal location.
- Classification includes epibulbar dermoid, dermolipoma, and complex choristoma based on histology.
- These lesions present a diagnostic challenge, particularly when ossification is present.
Observation:
- A case of a presumed epibulbar dermolipoma in a 9-year-old girl was noted.
- The lesion, initially managed conservatively, showed growth and cosmetic concerns over two years.
- Preoperative imaging and examination did not reveal ossification.
Findings:
- Histological examination of the surgically debulked lesion revealed it to be a complex choristoma.
- Unexpected ossification was identified within the lesion upon histological analysis.
- The presence of bone did not alter the initial clinical or surgical management approach.
Implications:
- Orbital surgeons must consider the possibility of ossification in epibulbar choristomas.
- Accurate histological classification is crucial for understanding these rare ocular growths.
- Awareness of ossification prevents misdiagnosis and ensures appropriate patient management.

