Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Seen are pleural and parenchymal scars , notably at the right lung base and right lateral aspect of the lungs , overall unchanged compared to the prior exam . There is a small right pleural effusion , also overall unchanged compared to the prior exam . There is stable mild cardiomegaly compared to the prior exam . There is no pneumothorax . Note is made of discontinuity of the left hemidiaphragm , with herniation of fat , better characterized on the prior CT . Note is made of extensive aortic calcification on this study , however extensive coronary and aortic calcifications were also better characterized on the prior CT . Deformities of the right ___th ribs are likely due to old , healed rib fractures , as seen on the prior CT .
    OUTPUT:
    
1 . No acute abnormalities identified within the lungs . 2 . Stable right lung base pleural and parenchymal scars .