Myasthenia Gravis with Hyperthyroidism and Thymic Hyperplasia

This is the first case report of myasthenia gravis with cosxisting hyperthyroidism and thymic hyperplasia in Korea. Thirty two year-old man visited in the clinic with exthophalmos, ptosis, dysarthria and dysphagia. Serum anti-acetylcholine receptor and anti-microsomal antibodies was increased significantly. The chest CT showed a large soft tissue mass at the anterior mediastinum. The anti-thyroid drug, glucocorticoid, cholinesterase inhibitor and intravenous immunoglobulin was given as a treatment. After thyroid function is normalized, thymectomy will be done.