Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest provided . Upper lung lucency is consistent with emphysema . Lungs remain hyperinflated . There is persistent opacity at the right medial lung base which is most consistent with chronic atelectasis given findings on prior CT abdomen pelvis . The heart is mildly enlarged . The mediastinal contour is normal . No convincing evidence for pneumonia or edema . No pleural effusion or pneumothorax . Bony structures are intact .
    OUTPUT:
    
Emphysema , mild cardiomegaly . Opacity at the right medial lung base is most compatible with chronic atelectasis .