Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single AP upright radiograph was provided . An NG tube is seen coursing below the diaphragm . Lung volumes are low . Crowding of the pulmonary vasculature is consistent with pulmonary edema . A radiopaque density over the right hemidiaphragm is likely outside of the patient . Median sternotomy wires are intact . Patient is status post aortic and mitral valve replacement . Cardiomediastinal silhouette is unchanged . Osseous structures are intact .
    OUTPUT:
    
NG tube below the diaphragm . Moderate pulmonary edema .