Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Post - repair appearance of the upper mediastinum appears stable over multiple prior postoperative radiographs . Graft material and skin ___ are unchanged in position . The endotracheal tube , Swan - Ganz catheter , and mediastinal drain are unchanged in position . There is no pneumothorax . A persistent left retrocardiac opacity with air bronchograms is unchanged since the prior examinations , reflecting atelectasis , although underlying consolidation can not be excluded . No pleural effusion is present .
    OUTPUT:
    
1 . No effusions . 2 . Persistent left lower lobe atelectasis . Underlying consolidation can not be excluded .