Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac , mediastinal and hilar contours are within normal limits with the heart size within normal limits . The pulmonary vasculature is not engorged . Ill - defined nodular and patchy opacities are noted bilaterally , most pronounced in the lung bases . No pleural effusion or pneumothorax is identified . No acute osseous abnormalities detected .
    OUTPUT:
    
Ill - defined nodular and patchy opacities , predominantly in a bibasilar distribution , concerning for infection .