Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post median sternotomy and CABG . The cardiac silhouette is mildly enlarged . The aorta is calcified and tortuous . Lung volumes are relatively low lung there bibasilar opacities . Left base opacity with obscuration of the left hemidiaphragm may be due to atelectasis however , underlying consolidation and / or small effusion is not excluded . There may also be a small right pleural effusion . Right paratracheal opacity without definite indentation on the adjacent trachea may be due to prominent vasculature or enlarged right lobe of the thyroid . Subtle retrocardiac lucency seen most likely relates to a hiatal hernia . Partially imaged high - riding left humeral head may be due to rotator cuff disease .
    OUTPUT:
    
Left base opacity without aspiration left hemidiaphragm may be due to atelectasis , however , underlying consolidation and / or small pleural effusion is not excluded . There may also be a small right pleural effusion .