Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . Retrocardiac opacity with elevation of the left hemidiaphragm reflects probably a combination of gaseous distension of the stomach as well as atelectasis . The heart is probably mild - to - moderately enlarged . The patient is status post median sternotomy and wires appear intact . Mediastinal clips are present . No definite focal consolidation , edema , pneumothorax , or pleural effusion . No acute osseous abnormality . Prominent multilevel degenerative changes of the thoracic spine with anterior osteophytes is noted . Dextroconvex scoliosis of the thoracic spine is mild - to - moderate .
    OUTPUT:
    
Low lung volumes and left lower lobe atelectasis .