Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A right internal jugular sheath has been removed . Sternotomy wires , mediastinal clips and an aortic valve prosthesis are constant . Substantial infrahilar atelectasis has improved from ___ . The small left pleural effusion is unchanged in volume . Mild pulmonary edema and the right pleural effusion have resolved . The heart is borderline enlarged but unchanged , accounting for differences in technique . No pneumothorax .
    OUTPUT:
    
1 . Unchanged small left pleural effusion . 2 . Improvement in substantial infrahilar atelectasiss from ___ .