Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are hypoinflated , accounting for some bronchovascular crowding . Vague opacity overlying the left costophrenic angle may represent atelectasis . Cardiomediastinal and hilar contours are unremarkable . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
Small opacity overlying the left costophrenic angle may represent atelectasis .