Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral chest views were obtained with patient upright position . Analysis is performed in direct comparison with the next preceding similar study of ___ . Comparison demonstrates stable chest findings . Thus , there is status post aortic stent grafting in the entire descending aorta , old radiation treatment scar formations in right upper lobe status post malignancy treatment and right - sided pleural thickenings and scar formations . The left lung base remains clear and there is no evidence of left - sided pleural effusion as the pleural sinus remains free . The extensive right - sided pleural densities remain unchanged . No pneumothorax is seen .
    OUTPUT:
    
No evidence of new left - sided pleural effusion . Prominence of the heart within the left hemithorax may explain the observed increased dullness over the left base .