Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lung volumes are low . There is a dense left retrocardiac opacity compatible with atelectasis and / or consolidation . Linear atelectasis is also noted in the right lower lobe . No significant pulmonary edema . There is cardiomegaly as before with aortic knuckle calcification . Left upper chest wall pacemaker with pacer wires remain in unchanged position . Endotracheal tube tip terminates 3 .5 cm above the carina and is in unchanged position . Enteric tube traverses below the diaphragm with tip terminating in the stomach . EKG leads overlie the chest wall . There is diffuse demineralization as before .
    OUTPUT:
    
1 . Unchanged dense left retrocardiac opacity compatible with atelectasis and / or consolidation associated with a small left pleural effusion . 2 . Linear atelectasis in the right lower lobe . 3 . No pulmonary edema . 4 . Lines and tubes as above .