Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP upright and lateral views of the chest were provided . Midline sternotomy wires and mediastinal clips are again noted . There is a band - like opacity at the left lower lung , which is new from prior study and given the associated volume loss is likely to represent atelectasis . No free air below the right hemidiaphragm . Given the low lung volumes , there is no obvious consolidation or overt signs of edema . The heart and mediastinal contours appear normal . No bony abnormalities are seen . Distended gas - filled loops of bowel in the upper abdomen are partially imaged .
    OUTPUT:
    
Left basal atelectasis . Limited exam due to low lung volumes . No free air below the right hemidiaphragm . Please refer to subsequent CT of the abdomen and pelvis for further details .