Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac silhouette size is normal . The aorta is mildly unfolded . Mediastinal and hilar contours are otherwise unremarkable . Pulmonary vasculature is not engorged . Patchy opacities are noted in the lung bases , more pronounced on the left , concerning for infection or aspiration . There is no pleural effusion or pneumothorax . Moderate multilevel degenerative changes are seen in the thoracic spine .
    OUTPUT:
    
Patchy opacities in the lung bases , more pronounced on the left , may reflect infection or aspiration .