Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There relatively low lung volumes . There is blunting of the left costophrenic angle concerning for small pleural effusion with overlying atelectasis . No pneumothorax is seen . The cardiac and mediastinal silhouettes are grossly stable . .
    OUTPUT:
    
Blunting of the left costophrenic angle raises concern for small left pleural effusion .