[Diagnosis and treatment of thymus tumors]

Data on treatment of 13 cases of thymoma of the mediastinum are considered. Differential diagnosis between benign and malignant thymoma may be obtained in some patients by means of clinical, X-ray and laboratory examination. Thymomas should be removed lest they should become malignant and be aggravated by myasthenic and mediastinal syndrome. Removal of malignant thymoma should be followed by X-ray therapy.