Frontal CT scan of the chest. A bulky and partially calcified mass originating from the anterior mediastinum and expanding into the right hemithorax is seen. The multi-chambered appearance of the mass appears similar to that observed on chest ultrasound. The mass caused a shift of the mediastinal structures to the left and compression of the right lung parenchyma. The middle lobe bronchus was not visualized, probably because it was completely compressed by the mass.