Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiomediastinal and hilar contours are stable . There is no pleural effusion or pneumothorax . Lung volumes are low with apparent crowding of bronchovascular structures . A left basilar opacity may represent pneumonia in the correct clinical setting . The upper abdomen is unremarkable .
    OUTPUT:
    
Low lung volumes . Left basilar opacity may represent atelectasis or pneumonia in appropriate clinical setting .