Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable frontal chest radiograph demonstrates slight interval improvement in lung volumes , as well as in bibasilar atelectasis . Subsegmental and dense retrocardiac atelectasis remains , along with moderate bilateral pleural effusions which are not significantly changed . The cardiac silhouette and mediastinal contours are unchanged . Median sternotomy wires remain intact . A right internal jugular approach sheath remains in place with its tip in the upper SVC . The pulmonary vasculature is normal .
    OUTPUT:
    
Slight interval improvement in bibasilar atelectasis , with similar moderate bilateral pleural effusions .