Mediastinal thoracic duct cyst adjacent to left pericardium.

Fig. 1. A chest computed tomography showed a 5.5 4.5 cm sized, homogeneous, non-enhancing cystic mass with a well-defined border, situated beside the left pericardium superior to the diaphragm (A, B). Thoracoscopic view of the cyst, located at the left cardiophrenic angle which was adherent to the diaphragm and pericardium anterior to the phrenic nerve. The wall was smooth and somewhat transparent (C). The retrieved cyst filled with saline (D) (P: pericardium, L: collapsed lung, and Arrow: phrenic nerve).