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 mediastinal clips again noted with a prosthetic cardiac valve . There are streaky perihilar opacities most likely reflecting relating to mild edema . ___ B - lines also noted . No large effusion or pneumothorax . Cardiomediastinal silhouette appears stable . The aorta is unfolded and calcified . Bony structures are intact .
    OUTPUT:
    
Mild pulmonary interstitial edema .