Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Left base opacity could be due to atelectasis versus consolidation due to infection or aspiration . Additional left base subsegmental atelectasis is seen . There is mild right mid lower lung atelectasis . No large pleural effusion is seen . There is no evidence of pneumothorax . The cardiac silhouette is top - normal . The aorta is somewhat tortuous . There may be some mild right perihilar peribronchial wall thickening .
    OUTPUT:
    
Left base opacity could be due to atelectasis versus consolidation due to infection or aspiration .