Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac silhouette size is normal . Mild atherosclerotic calcifications are noted at the aortic knob . Mediastinal and hilar contours are unremarkable . Pulmonary vasculature is not engorged . Lungs are hyperinflated with flattening of the diaphragms suggestive of underlying COPD . Biapical pleural scarring is symmetric . Minimal patchy opacities are noted in the left lower lobe , which may reflect atelectasis though infection is not excluded . Severe compression fracture of the T12 appears chronic as do multiple left - sided posterior rib fractures .
    OUTPUT:
    
Patchy left lower lobe opacity may reflect atelectasis , but can not be excluded in the correct clinical setting .