Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . There is minimal atelectasis in the right lung base but no other focal opacities . In the left lung base there is moderate to severe atelectasis of the left lower lobe with an associated small pleural effusion . The cardiac size can not be adequately assessed due to obscuration of the left heart margin by a atelectatic left lower lobe . Aorta is tortuous . There is no pneumothorax .
    OUTPUT:
    
Moderate to severe left lower lobe atelectases and mild right lower lobe atelectasis . No focal opacities concerning for pneumonia .