Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size remains moderately enlarged with marked mitral annular calcifications again noted . Left - sided dual - chamber pacemaker device with leads terminating in the right atrium and right ventricle is unchanged . The mediastinal and hilar contours are stable . There is calcification of the thoracic aorta diffusely . Mild pulmonary edema persists . Small left pleural effusion appears new compared to the previous exam . Patchy opacity within the retrocardiac region likely reflects atelectasis . No pneumothorax is identified . There is diffuse demineralization of the osseous structures .
    OUTPUT:
    
Mild pulmonary edema , similar to the prior exam , and new small left pleural effusion . Retrocardiac opacity likely reflects atelectasis .