Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Again seen is a dual - lumen catheter with both lumens overlying the right atrium . There is moderate cardiomegaly , probably less pronounced and with better definition of the cardiomediastinal borders . There is upper zone redistribution , but there has been marked improvement in the CHF / remain pulmonary edema findings . Mild residual vascular blurring a is present . Probable residual left base atelectasis , seen is increased retrocardiac density , but the left hemidiaphragm is now distinctly visible . No gross effusion . The right hemidiaphragm is elevated . No pneumothorax is identified . Clips noted over left thoracic inlet . Densely calcified tortuous splenic artery is again noted .
    OUTPUT:
    
Marked interval improvement in the CHF findings . Now only minimal residual upper zone redistribution and slight vascular blurring .