Abstract
A 71 year old woman presented with a feeling of chest compression.
Plain and lateral chest radiography showed a smooth, oval homgeuous radiodensity in the right cardio phrenic angle, touching the anterior chest wall and the anterior portion of right hemidiaphragm, Ultrasonography and CT scan revealed the cystic nature of the Diagnosis was confirmed by needle aspiration, whith obtained slightly yellowish and clear fluid. After the procedure, the abnormal shadow disappeared and there was no tendency for fluid to reaccumulation, Her symptom also completely disappeared.