Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post median sternotomy . The cardiomediastinal silhouette is stable . Linear left base retrocardiac atelectasis is seen . Mild blunting of the bilateral posterior costophrenic angles may be due to trace pleural effusions , this finding has been present since ___ . No focal consolidation or pneumothorax . No pulmonary edema is seen .
    OUTPUT:
    
Left basilar linear atelectasis and possible trace pleural effusions .