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Abstract:
The authors reported five cases of eyelid ptosis with progesssive external ophthalmoplegia. They emphasize infra-clinic diffusion, fatigability and variability impairment of extra-ocular muscles; coexistence of myogenic E.M.G. and single potential recurring at high frequency in the same patient; mitochondrial abnormalities in type I fibers, intense oxydative activity in superior oblique muscle and normal motor end-plates.