Mitochondrial pseudomyasthenia
Jason J S Barton1, John Maguire, Michelle Mezei
1Departments of Medicine (Neurology), University of British Columbia, Vancouver, British Columbia, Canada. jasonbarton@shaw.ca
Abstract:
The classic ocular motor presentation of mitochondrial disorders is chronic, symmetric, and diffuse weakness. We describe a man with 25 years of asymmetric ptosis, ophthalmoparesis, and facial weakness that partially responded to steroid therapy. Serologic and electrophysiological investigations for myasthenia gravis were negative, but muscle biopsy confirmed a mitochondrial myopathy. This case illustrates the potential of mitochondrial ophthalmoparesis to mimic the features of ocular myasthenia.
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