Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post median sternotomy , CABG , and left - sided pacemaker device with leads terminating in the right atrium and right ventricle . Right PICC tip terminates in the region of the SVC . There are low lung volumes . The heart size remains moderate - to - severely enlarged , but the mediastinal contour appears stably widened . There is crowding of the bronchovascular structures , but no overt pulmonary edema is present . Retrocardiac opacity likely reflects atelectasis as does minimal linear opacity within the right lung base . No large pleural effusion or pneumothorax is identified . The right internal jugular central venous catheter has been removed .
    OUTPUT:
    
Low lung volumes . Cardiomegaly without pulmonary edema .