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Response of thymoma to steroids.

The response of the thymus to steroids has been of use for diagnosis and therapy. However, the results have been somewhat variable. The subject of this report is a patient with a thymoma who was observed for 20 months and exhibited complete disappearance of the mass on low dosage of prednisone. The tumor recurred when steroid therapy was withdrawn. Response to the administration of steroids is of no help in separating, with certainty, normal thymus from thymoma, or benign thymoma from the malignant variety.