The authors report the 10-year follow-up of a case with a recurrent ptosis affecting both eyelids independently. The histology of the levator palpebrae superioris and Müller's muscle was consistent with a localised myopathic process. A therapeutic response to acetazolamide suggests that ion-channel dysfunction may be the underlying cause for this new myopathy.
- Lid crease sign
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Competing interests None.
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