I have been testing for MG and they were not sure if that or a muscle disease. I had a postive EMG, then negative EMG, all negative antibodies. I had a positive SFEMG.

I had the muscle biopsy right after Christmas and it was abnormal. Provisional results are "skeletal muscle with rare atrophic myofibers".
Under the findings they said:
"Rare atrophic myofibers found among normal sized fibers"
"Most of the atrophic fibers are type 2. There are no significant fiber type grouping or fiber type dominance"
"Four myofibers shoe increased staining of succinate dehydogenase. At least two of the fibers suggests hyper contraction, a common artifact"
"The epimysial adipose tissue shows mild reactive changes including early focal fibrosis and a few histiocytes or macrophages"

Any ideas? Thanks.