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Sclerosing thymoma—a possible phenomenon of regression

Case 1 A 39-year-old female patient was admitted because of sudden onset of palpitation and dyspnea. She was diagnosed to have myasthenia gravis 3 years previously. She refused thymectomy at that time and took her medication irregularly. At admission, she was in respiratory distress and was found to have pneumothorax, which was treated with insertion of a chest tube. A chest roentgenogram and CT scan did not reveal any mediastinal tumour. She proceeded to thymectomy. The myasthenic symptoms gradually improved after surgery and she has been in remission for 4 years.