Figure 2. (a) Contrast enhanced thorax CT showed a 6 cm x 5 cm x 4 cm mass with a predominant cystic component The cyst was surrounded by a smooth, well defined wall of uniform thickness. (b) A solid component of soft tissue attenuation with borders that were not separable from the ascending aorta was also observed. (c) At the level of left atrium, the mass appears to have no solid component at all.