Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Endotracheal , enteric , and left basilar chest tubes remain in unchanged positions . Lung volumes remain low . Heart size is moderately enlarged but likely exaggerated due to low lung volumes . Widening of the superior mediastinal contour is unchanged . There is improved aeration of the left lung with continued opacity in the retrocardiac region likely reflective of residual atelectasis . Mild pulmonary vascular engorgement is also likely present . Aeration of the right lung base also appears slightly improved with residual atelectasis . Known right - sided rib fractures are not well assessed on this exam .
    OUTPUT:
    
Slight interval improvement in aeration of the left lung and right lung base with continued left basilar opacity , likely residual atelectasis .