Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A vague opacity projecting over the medial aspect of the right lower lobe appears to be stable since the prior radiograph . Given that the prior CT showed no evidence of parenchymal abnormality , this is likely due to vasculature . A tortuous aorta is noted , also stable finding . There is no evidence of pneumonia , pneumothorax , or pleural effusion . Cardiac silhouette is normal in size .
    OUTPUT:
    
No evidence of acute parenchymal abnormality . Re demonstrated is a tortuous aorta in this patient with a known type B dissection .