Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lateral view is limited secondary to patient 's arms being down by her side . The heart is moderately enlarged on this AP view . The aorta shows calcified atherosclerosis . There is no pneumothorax or pleural effusion . A linear opacity in the mid left lung may represent atelectasis or scarring . More subtle opacities at the base of the left lung could represent atelectasis or infection .
    OUTPUT:
    
Subtle opacity at the base of the left lung may reflect subsegmental atelectasis or infection in the appropriate setting . A more linear opacity in the left mid lung likely reflects atelectasis .