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Discoid lupus erythematosus in a patient with myasthenia gravis

Dear Editor, A 49-year-old woman was referred to our department, complaining of erythematous lesions on the face that had appeared 6 months previously. A physical examination revealed a well-circumscribed, keratotic erythematous plaque on her left cheek (Fig. 1a). A few similar scaly erythemas were found on her forehead. She was suffering from myasthenia gravis (MG), which was confirmed by the detection of the acetylcholine receptor (AChR) antibodies in the serum and a typical electromyographic pattern. At the initial visit to us, she had been treated with oral prednisolone (10 mg/day). A thymectomy scar was also recognized (Fig. 1b). Laboratory data on blood chemistry including liver and renal