Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are lower on the current exam with secondary crowding of the bronchovascular markings . There is mild superimposed pulmonary edema . More discrete opacities in the right mid to lower lung as well as in the retrocardiac region are now seen . Moderate cardiac enlargement is grossly similar given lower lung volumes . Degenerative changes noted at the shoulders . Old right lateral rib fractures are seen . Surgical clips seen in the right upper quadrant .
    OUTPUT:
    
Opacities in the retrocardiac region and right mid to lower lung which could be due to atelectasis given lower lung volumes on the current exam . Superimposed infection would be difficult to exclude . Cardiomegaly and mild pulmonary edema .