Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Right PICC ends in the low SVC . Postsurgical widening of the mediastinum is slowly improving . The cardiac silhouette remains moderately enlarged . Small bilateral pleural effusions greater on the right than the left are unchanged . Bibasilar opacities persist . Air is seen in the retrosternal space on the lateral view likely related to recent surgery .
    OUTPUT:
    
Improvement in postsurgical appearance of the mediastinum with stable small pleural effusions with bibasilar opacities .