Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A dialysis catheter terminates in the upper right atrium . The heart is mildly enlarged . The mediastinal and hilar contours appear unchanged . There is a diffuse interstitial abnormality suggesting mild - to - moderate pulmonary edema . Particularly in the left retrocardiac region , there is more focal opacification of uncertain significance , but possibly superimposed atelectasis or even pneumonia . There is no pleural effusion or pneumothorax . Moderate anterior osteophytes are noted along the lower thoracic spine .
    OUTPUT:
    
Findings suggestive of mild - to - moderate pulmonary edema . Patchy retrocardiac opacity in the left lower lobe could be associated with the same process , but since it somewhat focal , in the appropriate clinical setting , atelectasis or even pneumonia could be considered .