Isolated traumatic neurogenic ptosis with delayed recovery.

PURPOSE: To describe the entity of isolated neurogenic ptosis due to presumed tractional injury to the nerve of innervation of the levator palpebrae superioris, with recovery occurring over a period up to 6 months.
METHODS: Retrospective case review.
RESULTS: Three cases of presumed neurapraxic injury to the nerve of innervation to the levator palpebrae superioris are described. Two cases had a clear history of traction to the upper eyelid. There was no evidence of damage to other extraocular muscles or their nerves of innervation in 2 cases and mild transient superior rectus underaction in 1. Maximal recovery occurred over a period of up to 6 months.
CONCLUSIONS: Traumatic neurapraxic injury to the nerve of innervation to the levator palpebrae superioris may occur in certain types of upper eyelid injury, most notably when there is significant forward traction applied to the upper eyelid. Although recovery may occur within weeks, as previously described, this series illustrates that recovery may take up to 6 months.