Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . The mediastinal and hilar contours are unremarkable . Ill - defined patchy opacities are noted in both lung bases , left more so than on the right , concerning for infection or aspiration . No pleural effusion or pneumothorax is visualized . The pulmonary vascularity is not engorged . No acute osseous abnormality is identified .
    OUTPUT:
    
Patchy ill - defined opacities in both lung bases , left more so than right concerning for infection or aspiration .