There is a huge heterogenous antero-superior mediastinal mass, mainly of fat density with thick soft tissue strands within, without calcification or fat-fluid level. Most of the left lung (except for apico-posterior segment of the upper lobe) is completely collapsed. Moderate shift of the mediastinum and the heart to the right side. The mass effect on the left pulmonary vessels and major airways is also obvious. Superior venal cava is patent and not compressed.
No pleural effusion. Incidental note of enlarged left thyroid lobe with retrosternal extension.
Imaged upper abdomen is unremarkable.
Impression: Imaging appearance are highly suggestive of a thymolipoma. Mediastinal liposarcoma thought very unlikely.