Abstract
A 50-year-old woman was found to have an abnormal shadow on a routine chest x-ray. Right middle lobe syndrome was diagnosed 15 years ago. Since then the abnormal shadow had been noted several times on routine examinations. Chest CT scans revealed a tumor adjacent to the thymus; the CT number was-97-103, indicating fatty tissue. The shape of the tumor changed in chest x-rays taken in the decubitus position. Internal mammary arteriograms revealed that the tumor was supplied by the thymic artery. The preoperative diagnosis was thymolipoma.
