Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac , mediastinal and hilar contours are normal . The pulmonary vascularity is within normal limits . Subtle ill - defined opacity is noted within the left lower lobe concerning for early infection . The right lung is clear . No pleural effusion or pneumothorax is present . No acute osseous abnormality is seen .
    OUTPUT:
    
Subtle ill - defined opacity within the left lower lobe is concerning for early infection .