Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are slightly hypoinflated with bilateral lower lobe atelectasis . No pleural effusion or pneumothorax . Heart size , mediastinal contour and hila are unremarkable . Calcification of aortic arch is present . Evidence of multiple posterior right healed rib fractures with severe rib cage deformity . Previous right clavicular fracture with intact hardware . No evidence of hardware loosening . Limited assessment of the upper abdomen is within normal limits .
    OUTPUT:
    
1 . Hypoinflated lungs with bibasilar opacities which favor atelectasis although differential diagnosis includes aspiration and infectious pneumonia . Considering clinical suspicion for infection , followup PA and lateral chest radiographs may be helpful to more fully evaluate the lung bases 3 . Multiple posterior healed rib fractures with severe rib cage deformity . Limited evaluation for acute fractures .