Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post median sternotomy and CABG . Heart size is mildly enlarged with left ventricular predominance . The aorta is mildly tortuous . Mediastinal and hilar contours otherwise are within limits . Mild interstitial abnormality is demonstrated within the lung bases with a peripheral distribution , suggestive of chronic changes . Streaky opacity in the left lung base may reflect atelectasis . No focal consolidation , pleural effusion or pneumothorax is detected . There are no acute osseous abnormalities . No pulmonary vascular congestion is visualized .
    OUTPUT:
    
Probable left basilar atelectasis . No focal consolidation to suggest pneumonia .