Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is complete opacification of the left hemi thorax with leftward shift of mediastinal structures compatible with left long collapse . Additionally , a lobulated contour of the right superior mediastinum and perihilar region suggests presence of mass lesions , potentially lymphadenopathy . Right lung is clear . No pneumothorax is seen . Pulmonary vasculature is not engorged . There are no acute osseous abnormalities .
    OUTPUT:
    
Complete opacification of the left hemithorax with leftward shift of mediastinal structures most compatible with collapse . Abnormal right superior mediastinal and perihilar contour concerning for underlying mass lesions such as lymphadenopathy . Further assessment with chest CT with contrast is recommended .