Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . Mediastinal and hilar contours are unremarkable . The pulmonary vasculature is normal . Patchy opacity is demonstrated in the left lower lobe which may reflect an area of developing infection . No focal consolidation , pleural effusion or pneumothorax is present . A BB marker overlies the right eleventh rib . No acute osseous abnormalities are seen in the vicinity of this marker . No rib fracture is detected .
    OUTPUT:
    
1 . Patchy left lower lobe opacity which may reflect an area of developing infection . 2 . No rib fracture identified .