I'm a 45 year old female who has had migraines and problems walking for one year. I recently came back from the Mayo clinic and was told I had cox negative fibers with no ragged red fibers in my muscle biopsy. They have sent my muscle sample to a lab to get DNA tests, and this will take two months. Their guess is mitochondrial disease, but I've never had problems before my first episode of muscle weakness one year ago. I've been very athletic all of my life.
I'm wondering if there is anything else that can cause cox negative fibers?
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