Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A left lower lobe opacity may represent atelectasis or pneumonia The cardiomediastinal and hilar contours are within normal limits . There is no pneumothorax , fracture or dislocation . Limited assessment of the abdomen is unremarkable .
    OUTPUT:
    
A left lower lobe opacity may represent atelectasis or pneumonia in the appropriate clinical setting .