Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . The aorta remains mildly tortuous . Mediastinal and hilar contours are similar . Pulmonary vasculature is normal . No focal consolidation , pleural effusion or pneumothorax is present . Minimal patchy opacity within the left upper lung field is new compared to the prior study . Relatively symmetric scarring within the lung apices is re - demonstrated as well as a focal . No acute osseous abnormalities are visualized .
    OUTPUT:
    
Subtle ill - defined patchy opacity in the left upper lung field , new from prior , may reflect an area of developing infection .