Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The central venous catheter from a right IJ approach tip is at the cavoatrial junction . The heart size is at the upper limits of normal . The mediastinal contours are within normal limits . Mild pulmonary vascular congestion is seen . The lungs demonstrate improving consolidation of the retrocardiac space , either representing improving atelectasis or pneumonia . Additionally , a new left upper lobe opacity is seen , concerning for a developing pneumonia . There is no large pleural effusion or pneumothorax . Degenerative changes are seen in the spine .
    OUTPUT:
    
New left upper lobe opacity which may represent a developing pneumonia in the appropriate clinical setting . Improving retrocardiac consolidation may represent improving atelectasis or pneumonia .