Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A frontal semi-upright view of the chest was obtained portably . The lungs are well expanded and clear without focal consolidation , pleural effusion or pneumothorax . Incidentally noted is an azygous lobe . Heart size is normal . Mediastinal silhouette and hilar contours are normal . The patient is status post median sternotomy and CABG . Pulmonary vasculature is within normal limits . There is mild bibasilar atelectasis .
    OUTPUT:
    
No acute intrathoracic process .