Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Sternotomy . Right IJ central line tip low SVC . Elevated right hemidiaphragm , similar . Improved bibasilar opacities . Trace fluid versus atelectasis right lower lung . Tortuous thoracic aorta . Small bilateral pleural effusions . Mild compression fracture lower thoracic spine .
    OUTPUT:
    
Improvement since prior exam