Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There remains marked widening of the left upper and mid mediastinum at the level of the aortic arch , corresponding to the site of the patient 's reported descending aortic replacement procedure . The width of approximately 11 cm is similar to the recent study of one day earlier . Left - sided chest tubes have been removed since the prior radiographs , with development of small - to - moderate left pleural effusion and a small basilar lateral pneumothorax . Increasing homogeneous opacity in the right lower hemithorax is probably a combination of pleural fluid and adjacent atelectasis and / or consolidation .
    OUTPUT:
    
Stable mediastinal widening at operative site . New left hydropneumothorax following chest tube removal .