Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are well expanded , without focal opacities . A triangular opacity obscuring the right cardiophrenic angle is compatible with a prominent epicardial fat pad , confirmed on the lateral view . Otherwise , cardiomediastinal and hilar contours are unremarkable . The sternotomy wires and mediastinal clips are likely from prior cardiothoracic surgery . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
No evidence of acute cardiopulmonary process .