Oculoectodermal syndrome

Oculoectodermal syndrome (OES), also known as oculo-ectodermal syndrome or epidermal nevus syndrome with ocular involvement, is a rare congenital disorder characterized by the combination of epibulbar dermoids (benign growths on the surface of the eye) and aplasia cutis congenita (areas of absent skin, typically on the scalp). The condition primarily affects the eyes and skin (ectodermal tissues), and has been associated with activating mutations in the KRAS gene, occurring as a mosaic (postzygotic somatic) event rather than being inherited from a parent. Key clinical features include epibulbar or limbal dermoids, which are benign choristomas found on the eye surface that may affect vision, and areas of congenital skin deficiency most commonly located on the scalp. Additional features that have been reported in some patients include skin tags or accessory tragi (small skin appendages near the ears), coloboma of the eyelid, and occasionally other ectodermal abnormalities. Some patients may also present with pigmented skin lesions or organoid nevi. The severity and combination of features can vary considerably between affected individuals. There is no specific cure for oculoectodermal syndrome. Management is symptomatic and supportive, tailored to the individual's clinical manifestations. Surgical removal of epibulbar dermoids may be considered if they impair vision or for cosmetic reasons. Aplasia cutis congenita lesions on the scalp may require wound care and occasionally surgical repair. Regular ophthalmologic and dermatologic follow-up is recommended. Genetic counseling should be offered to affected families, though the condition typically arises sporadically due to somatic mosaicism.

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