Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Right - sided dual - lumen central venous catheter tip terminates in the right atrium . Patient is status post median sternotomy , CABG , and mitral valve replacement . Dense coronary artery calcifications are noted . Mild cardiomegaly is re - demonstrated , perhaps slightly decreased in size from the prior study . Mediastinal and hilar contours are unchanged . Pulmonary vasculature is not engorged . Patchy opacity in the lung bases likely reflect atelectasis , without focal consolidation . No pleural effusion or pneumothorax is seen . Left axillary vascular stent is partially imaged . Moderate degenerative changes are noted in the lower thoracic spine .
    OUTPUT:
    
No acute cardiopulmonary abnormality .