Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Patient is status post median sternotomy CABG . Lung volumes are slightly low . Heart size is normal . Mediastinal and hilar contours are unremarkable . Crowding of bronchovascular structures is present without overt pulmonary edema . Patchy atelectasis is noted in the lung bases . No focal consolidation , pleural effusion or pneumothorax is demonstrated . No acute osseous abnormality is visualized . Sclerotic focus in the left glenoid is unchanged .
    OUTPUT:
    
Low lung volumes with mild bibasilar atelectasis , but no focal consolidation .