Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a stable opacity at the left lung base consistent with rounded atelectasis . This was better evaluated by CT . The lungs appear otherwise clear and unchanged . The heart is within normal limits in size . The aorta is calcified . Mediastinal structures are otherwise unremarkable . The bony thorax is grossly intact . There is no significant interval change
    OUTPUT:
    
Stable opacity at the left lung base consistent with rounded atelectasis . Otherwise unremarkable study .