Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP upright and lateral views of the chest provided . Midline sternotomy wires and prosthetic cardiac valve are again noted . There are small bilateral pleural effusions noted with probable mild pulmonary interstitial edema . There is no convincing evidence for pneumonia . Cardiomediastinal silhouette is stable . Bony structures appear intact .
    OUTPUT:
    
Small bilateral pleural effusions , mild interstitial edema .