Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post median sternotomy , CABG and stent placement . Heart size is normal . The aortic knob is calcified . Mediastinal and hilar contours are unremarkable . Low lung volumes are present which results in crowding of the bronchovascular structures . There are minimal ill - defined streaky and nodular opacities in the lung bases . No focal consolidation , pleural effusion or pneumothorax is present . There is no frank pulmonary edema . No acute osseous abnormalities detected .
    OUTPUT:
    
Low lung volumes . Minimal streaky and ill - defined nodular opacities in the lung bases could reflect atelectasis though infection is not completely excluded . No overt pulmonary edema .