Epipalpebral conjunctival osseous choristoma

Area of Science:

• Ophthalmology
• Surgical Pathology
• Medical Case Reports

Background:

• Osseous choristoma is a rare congenital tumor characterized by the presence of mature bone tissue in an abnormal location.
• Epibulbar choristomas are typically found on the surface of the eye, often in the conjunctiva or episclera.
• These tumors are often mistaken for dermoids due to their similar appearance and location.

Observation:

• This report details two distinct cases of osseous choristoma.
• Case 1: An osseous choristoma located in the conjunctiva of the right lower eyelid, an unusual site for this type of tumor.
• Case 2: A more typical epibulbar osseous choristoma situated in the superior temporal quadrant of the episclera.

Findings:

• Histopathological examination confirmed the diagnosis of osseous choristoma in both cases.
• The tumor in the lower eyelid conjunctiva represented a unique presentation of osseous choristoma.
• The epibulbar tumor exhibited characteristics consistent with previously documented cases.

Implications:

• These cases expand the known spectrum of locations for osseous choristomas.
• Accurate diagnosis and differentiation from similar orbital tumors like dermoids are crucial for appropriate management.
• Further research into the embryological origins of these tumors may provide insights into their development.