Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single frontal view of the chest was obtained . The patient is status post median sternotomy and cardiac valve replacement . The patient is rotated slightly to the right . There are low lung volumes . The cardiac and mediastinal silhouettes are stable . There is slight blunting of the right costophrenic angle , which could be due to an underlying pleural effusion . There is mild interstitial edema . No definite focal consolidation . Interval removal of left - sided PICC .
    OUTPUT:
    
Low lung volumes and mild interstitial edema . Trace blunting of the right costophrenic angle may be due to a trace pleural effusion .