정기적인 혈액투석중에 발생되어 자연 퇴화전 방추 세포형 흉선종

A 34-year-old male who has recieved regular hemodialysis three times a week for 2years due to chronic renal failure was admitted due to chest pain. Chest x-ray and computed tomography showed large sized anterior mediastinal mass compressing heart and great vessels posteriorly. Open lung biopsy was performed and the result was spindle cell type thy-moma. We recommanded surgical resection but he refused and discharged. After 8months, we observed marked regression of the thymoma without any other treatment. We report a case of spontaneous regression of thymoma in patient with chronic renal failure during regular hemodialysis.