Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Left base atelectasis is seen . There is blunting of the left costophrenic angle which may be due to a trace pleural effusion . No pneumothorax is seen . The cardiac and mediastinal silhouettes are stable . No overt pulmonary edema is seen .
    OUTPUT:
    
Left base atelectasis . Blunting of the left costophrenic angle , trace pleural effusion not excluded . Underlying consolidation difficult to exclude . No pneumothorax seen .