Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are clear . There is no focal consolidation or pneumothorax . There is no overt edema or large effusions . Mediastinal and hilar contours are within normal limits . Mild cardiomegaly is noted . A prosthetic valve is also visualized . Linear opacities adjacent to the valve are also likely related to prior surgery . Median sternotomy wires appear grossly intact .
    OUTPUT:
    
No acute cardiopulmonary process .