Abstract
Abstract Polymyositis and myocarditis very rarely develop during chemotherapy for thymoma. Most reported cases of myocarditis and polymyositis associated with thymoma were found at autopsy of patients who died of acute progression of myocarditis. We describe our experience with a 64-year-old man who had recurrent thymoma accompanied by polymyositis and myocarditis. Lower-extremity myalgia and palpitations developed on day 25 of chemotherapy with weekly paclitaxel. Steroid pulse therapy was effective for the management of polymyositis and myocarditis associated with thymoma. Polymyositis and myocarditis after paclitaxel monotherapy have not been documented previously. Whether paclitaxel induced polymyositis and myocarditis is unclear and these symptoms might have been a paraneoplastic phenomenon associated with thymoma. However, our experience suggested that patients with thymoma who received paclitaxel-based chemotherapy should be carefully observed for polymyositis and myocarditis. If such patients have high serum creatine phosphokinase and troponin levels, steroid pulse therapy should be considered without delay.
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