Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size remains mildly enlarged . Aortic knob is calcified . Mediastinal and hilar contours are unchanged . Previously noted left upper lobe mass appears more vague with surrounding ill - defined opacity , possibly related to infection . There is a lingular opacity which is new compared to the prior study , and could reflect an area of infection . The right lung is grossly clear . No pleural effusion or pneumothorax is seen . There are no acute osseous abnormalities .
    OUTPUT:
    
1 . Lingular opacity is concerning for infection in the correct clinical setting . 2 . Previously seen left upper lobe mass appears more vague with adjacent ill - defined opacity which could reflect post - treatment changes .