Ocular myasthenia gravis mimicking progressive external ophthalmoplegia

Abstract
A boy initially thought to have chronic progressive external ophthalmoplegia in association with myelopathy and peripheral neuropathy unexpectedly turned out to have ocular myasthenia gravis. Whereas progressive external ophthalmoplegia often has been accompanied by other nervous system signs, true myasthenia gravis only rarely has been so associated and never in the same rnanner as in this patient. On the other hand, some patients considered to have progressive external ophthalmoplegia, with or without additional nervous system disease, might have had myasthenia gravis, even when not responsive to neostigmine.

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