Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volume is low . Large left pleural effusion is similar to 1 day ago . There is collapse of the left lower lobe . Mild opacity in the right lung base likely reflect atelectasis . Cardiac silhouette appears unchanged . Prominent pulmonary vasculature is stable . Old displaced fracture is noted at the lateral right ninth rib . Heavy calcification is noted throughout the aorta .
    OUTPUT:
    
Large left pleural effusion is stable compared to 1 day earlier .