Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral chest radiographs demonstrate stable moderate cardiomegaly . The mediastinum remains mildly enlarged , likely post-operative . Subsegmental left lower lobe atelectasis is again seen . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
1 . Stable left lower lobe subsegmental atelectasis . 2 . Stable post-operative changes from recent CABG .