Pathological findings for Myasthenia Gravis


Muscle biopsy is only performed if the diagnosis remains in doubt and clinical suspicion of MG persists. Immunofluorescence shows IgG antibodies on the neuromuscular junction. (The antibody which causes myasthenia gravis does not fluoresce, but rather a secondary antibody directed against it.) Muscle electron microscopy shows receptor infolding and loss of the tips of the folds, together with widening of the synaptic clefts. Both these techniques are currently used for research rather than diagnostically.

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