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[Surgical resection with adjuvant chemotherapy for locally advanced Masaoka stage IVa thymoma; report of a case].

A 39-year-old woman was presented with a mediastinal tumor and some pleural tumors. A computed tomography (CT)-guided needle biopsy of the pleural tumor was undertaken which showed thymoma, type B1 according to the World Health Organization classification. She had underwent extended-thymectomy and resection of all pleural tumors. Histopathology confirmed these lesions to be type B2 thymoma and pleural dissemination. She received adjuvant chemotherapy. Two years after surgery the patient is alive without recurrence.