Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are hyperinflated . There is an increased opacity in the left upper lobe likely atelectasis , attention on follow - up studies needed There is no pneumothorax . Cardiac size is mildly enlarged . Lines and tubes in standard positions , no change . Again seen in the median sternotomy wires . Patient status post MVR and AVR .
    OUTPUT:
    
Increased opacity in the left upper lobe may be atelectasis but attention on follow - up studies is needed