Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral chest radiograph demonstrate mildly low lung volumes . With faint opacity posteriorly on the lateral view which is likely atelectasis . Elsewhere , lungs are clear . Cardiomediastinal and hilar contours are within normal limits . There is no pleural effusion or pneumothorax . No air under the right hemidiaphragm .
    OUTPUT:
    
Mildly low lung volumes . No definite evidence of pneumonia .