Supernumerary orbital muscle in congenital eyelid retraction

Purpose: Although several reports of supernumerary orbital muscles related to the levator palpebrae superioris have been published, no case has been a ssociated with congenital eyelid retraction. This report describes an appar ent causal relationship between an accessory levator muscle slip and congen ital eyelid retraction. Methods: Case report and literature review. Results: Release of the anomalous muscle's attachment from the superior tar sal border alone resulted in resolution of the eyelid retraction. Conclusions: Eyelid muscle anomalies may be a cause of congenital eyelid re traction. Ophthalmologists who treat eyelid disorders should be aware of th is possibility when evaluating and operating on patients with congenital ey elid retraction.