Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are poorly expanded . There are no focal opacities in the right lung . The left lung demonstrates stable opacity at the lateral left lung base representing post op changes with scarring / atelectasis , stable compared to multiple priors . Mild cardiomegaly is again noted . Cardiomediastinal and hilar contours are unremarkable otherwise . There is no evidence of pleural effusion or pneumothorax . Prominent vascular calcifications are noted at the level of the aortic knob . Fracture deformity of the posterolateral left sixth rib . External monitoring devices are present .
    OUTPUT:
    
No significant change compared with prior exam . Left lower lung field opacity is stable and represent postoperative changes of scarring / atelectasis .