Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single frontal chest radiograph demonstrates a right - sided central venous catheter terminating in the mid SVC . Mediastinal and pleural drains are stable in position . There is persistent but improved bilateral patchy opacifications , which may represent resolving background pulmonary edema ; however , there is a persistent , though again slightly improved , opacity within the right upper lobe and left mid lung , which may suggest superimposed pneumonia . No pleural effusion identified . No definite pneumothoraces are noted .
    OUTPUT:
    
On a background of improving pulmonary edema , there is continued opacification of right upper lung and left mid lung , concerning for superimposed pneumonia .