Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . Mediastinal and hilar contours are unremarkable . Pulmonary vasculature is not engorged . Patchy opacities are seen within the lower lobes bilaterally , more pronounced on the left . No pleural effusion or pneumothorax is seen . Hypertrophic changes are noted in the thoracic spine .
    OUTPUT:
    
Bilateral lower lobe patchy opacities , more pronounced on the left . These findings could reflect aspiration or pneumonia in the correct clinical setting , though atelectasis is also consideration .