Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac , mediastinal and hilar contours appear stable . There is no pleural effusion or pneumothorax . There is a mild interstitial abnormality primarily in the lower lungs , but not as severe and similar in pattern , so acuity is uncertain . This is accompanied by a mild suspected persistent atelectasis in the right middle lobe which has however decreased .
    OUTPUT:
    
Decreased right middle lobe opacification but mild interstitial process which is of uncertain chronicity .