Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal semi-erect view of the chest was obtained . Left internal jugular central catheter terminates in stable position , across the midline , in either the upper SVC or the left brachiocephalic vein . Known right upper lung abscess is not clearly visualized on this radiograph due to semi-erect position . Diffuse right hemithorax opacification remains , though aeration of the right lung appears slightly improved . The left costophrenic angle is excluded on this study .
    OUTPUT:
    
Slight improvement in aeration of the right hemithorax , although diffuse opacification of the right hemithorax persists . Known cavitary lung abscess is not clearly visualized on this semi-upright radiograph .