Recurrent ptosis in an adult due to isolated paresis of the levator palpebrae superioris and Muller's muscle of unknown aetiology

We report on the case of a middle-aged woman who suffers from recurrent rig ht-sided ptosis. The ptosis is always complete with preserved ocular motili ty. Full recovery is the rule. The involvement of both the Muller's muscle and levator palpebrae superioris is demonstrated clinically, pharmacologica lly, and by high-resolution magnetic resonance imaging. The results present ed point towards a local pathology of the lid surface anatomy; the etiology , however, remains unknown.