Abstract
A 53-year-old female consulted our hospital because of tremor. She was pointed out as showing an abnormal shadow on a chest radiograph before an operation for hyperthyroidism. CT revealed a giant mass located in the right mediastinum and compressing one third of the right thoracic cavity. MRI identified a mass consisting of lipoid components exhibiting a high signal intensity on both T1- and T2- weighted imaging. Under a diagnosis of giant lipoma with hyperthyroidism, thyroidectomy and thoracic surgery were performed via a median sternotomy approach. The tumor stemmed from the thymus, weighing 1,050 grams. Histological examination showed that the tumor consisted of mature fatty tissue and scattered thymic lesions. Thymolipomas with hyperthyroidism are very rare.
