Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac , mediastinal and hilar contours are normal . No focal consolidation , pleural effusion or pneumothorax is seen . A ___- mm ring - like opacity is noted within the left upper lobe , not clearly noted on the previous exams , which may reflect an area of infection or inflammation . There are no acute osseous abnormalities .
    OUTPUT:
    
Ring - like opacity within the left upper lobe could reflect an area of inflammation or infection . Followup radiographs after treatment are recommended to ensure resolution of this finding .