Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . Blunting of the left costophrenic angle may reflect trace pleural effusion . No edema , large pleural effusion , or pneumothorax . Retrocardiac streaky opacity is probably atelectasis . Heart size top - normal in size . No acute osseous abnormality .
    OUTPUT:
    
Trace left pleural effusion and atelectasis .