Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Patient is status post median sternotomy . The lungs are clear without focal consolidation . Slight blunting of the posterior left costophrenic angle may be due to atelectasis or versus a trace pleural effusion . No pneumothorax is seen . The cardiac and mediastinal silhouettes are unremarkable .
    OUTPUT:
    
Slight blunting of the posterior left costophrenic angle may be due to atelectasis versus trace pleural effusion . No focal consolidation to suggest pneumonia .