Congenital isolated osteoma cutis of the lateral canthus

Congenital solitary osseous choristoma of the left lateral canthus: a case report

BACKGROUND

An ocular osseous choristoma is a growth of mature, compact bone in the ocular or periocular soft tissue, and it is the rarest form of ocular choristoma, accounting for only 1.7% of all epibulbar choristomas.

CASE PRESENTATION

Herein we present the case of a 20-month-old girl who was referred to the oculoplasty clinic with a progressively growing mass in the left lateral canthus. It had been present since birth without ocular involvement. Upon examination the mass was firm with a smooth surface, measured 9 × 6 × 3 mm, and exhibited no episcleral attachment or ocular involvement. An excisional biopsy was performed, and the histopathological findings were consistent with osseous choristoma of the left lateral canthus.

CONCLUSIONS

This report highlights the importance of considering osseous choristoma in the differential diagnosis of eyelid lesions, particularly those that have been present since birth. It also emphasizes the need for further studies investigating associations between osseous choristomas and ocular canthi.

Congenital osteoma cutis of the lateral canthus

Osteoma cutis is a rare condition involving the formation of bone in skin or subcutaneous tissue. This may be a primary event or, more often, secondary to an inflammatory, traumatic, or neoplastic process. There is little evidence in the literature of this condition involving the eye or ocular adnexal structures. The authors report two remarkably similar cases involving children with congenital isolated osteoma cutis involving the left lateral canthus.