Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest ___ at 17 :03 are submitted .
    OUTPUT:
    
Status post median sternotomy with mitral valve replacement and stable cardiac and mediastinal contours . There are stable chronic interstitial changes in the lungs . No developing airspace consolidation is seen to suggest pneumonia . No pulmonary edema . No pneumothorax . Minimal blunting of both posterior costophrenic angles which could reflect tiny effusions or chronic pleural thickening .