Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: As before the patient is status post median sternotomy and CABG . The heart is mildly enlarged as before . The aorta is tortuous and mildly calcified . There is no pulmonary edema . Streaky opacities at the base of the left lung likely reflect atelectasis . There is no focal consolidation , pleural effusion or pneumothorax . No nondisplaced rib fractures are identified . Degenerative change throughout the thoracic spine is unchanged .
    OUTPUT:
    
Minimal basal atelectasis without focal consolidation , pleural effusion or pneumothorax . No nondisplaced rib fractures are identified .