Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is near complete opacification of the left hemithorax with only a small amount of aerated parenchyma in the mid / upper left lung . The right heart border is visible and there is no mediastinal shift . The left heart border is obscured and heart size can not be assessed . The right lung is well expanded and clear . Overlapping aortic stents are unchanged in position and an indentation along the upper margin of the stent appears similar . The sternotomy wires and surgical clips are noted . Degenerative changes are again seen in the shoulders . Surgical clips project over the right upper quadrant , as before .
    OUTPUT:
    
New near complete opacification of the left hemi thorax new compared to the prior examination . Findings could represent the large pleural effusion with atelectasis although infection or underlying lesion are entirely possible .