Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are well inflated . The right lung does not show any focal opacities . Some discoid atelectasis is present in the lower left lung field , but no other opacities are seen . There is mild cardiomegaly , but the cardiomediastinal contours are unremarkable otherwise . There is a tiny pleural effusion in the right . There is no pneumothorax . Right posterior rib deformities are more extensive than on prior but appear old . Chronic post-traumatic changes in the right coracoclavicular region are stable .
    OUTPUT:
    
No acute cardiopulmonary process .