Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lower lung volumes seen on the current exam . There is increased opacity at the right lung base which is confirmed on the lateral view , localizing to the lower lobe . Left basilar regions of scarring and pleural thickening are noted . Superiorly the lungs are clear . There is no overt pulmonary edema . Elevation of the posterior aspect of the left hemidiaphragm is unchanged seen on the lateral view . Moderate cardiomegaly with aortic and mitral valve prostheses are again noted . Right sided mediastinal vascular stent is identified .
    OUTPUT:
    
New right basilar opacity which could represent infection in the proper clinical setting . Alternatively this could be due to atelectasis . Otherwise , no change . No overt pulmonary edema .