Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Left - sided pacer is re - demonstrated with leads in unchanged positions in the right atrium and right ventricle . Moderate cardiomegaly is again noted with dense mitral annular calcifications . Atherosclerotic calcifications of the aortic arch are present with unchanged mediastinal and hilar contours . Pulmonary vasculature is not engorged . A small left pleural effusion appears relatively unchanged with interval decrease in size of the small right pleural effusion . Opacification in the left lung base is nonspecific and may reflect an and atelectasis but infection or aspiration is not excluded . No pneumothorax is present . Dextroscoliosis of the thoracic spine with degenerative changes is re - demonstrated .
    OUTPUT:
    
Small left pleural effusion , relatively unchanged , with opacification of the left lung base , potentially atelectasis but infection or aspiration can not be excluded . Near complete resolution of the small right pleural effusion .