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Figure 10a. Pleuropericardial cyst in a 43-year-old man. (a) Frontal radiograph shows an oval mass that obscures the cardiophrenic angle (arrow). (b) Axial unenhanced CT scan shows the thin-walled, sharply defined, oval, homogeneous mass; its attenuation is near that of water. (c) Follow-up unenhanced CT scan shows a decrease in the size of the lesion, a finding that occasionally occurs with pericardial cysts.