Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There are mild increased retrocardiac opacities . Mild increase interstitial findings are noted and may represent minimal pulmonary edema . The patient is status post mitral valve surgery with intact median sternotomy wires and mitral valve prosthesis . The lungs are clear with no evidence of a focal consolidation . There is no pleural effusion or pneumothorax . Cardiac and mediastinal silhouettes are normal . No acute fractures are identified .
    OUTPUT:
    
Mild left baisilar opacities likely representing atelectasis , though an early overlying infectious process must be excluded in proper clinical setting . Minimal pulmonary edema .