2016 Volume 30 Issue 6 Pages 716-720
We report a case of thymolipoma with a characteristic bilobed structure. A 21-year-old man was referred to our hospital because of an anterior mediastinal tumor simulating cardiomegaly on a screening chest radiograph. Chest computed tomography revealed a huge anterior mediastinal mass with isodensity similar to that of fat tissue. Median sternotomy and extended thymectomy were performed. The resected specimen had a bilobed structure, measured 24×18×5 cm, and weighed 670 g. The histopathological diagnosis was thymolipoma. The characteristic structure suggests that the pathogenesis of thymolipoma is a lipoma consisting of thymic fat tissue with involution of the thymus gland.