Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Right - sided dual lumen central venous catheter tip terminates in the right proximal right atrium . Heart size is normal . Aortic knob is calcified . Mediastinal and hilar contours are unremarkable . Mild pulmonary vascular congestion is noted , improved compared to the previous exam . No focal consolidation , pleural effusion or pneumothorax is demonstrated . Linear opacities within the left upper lobe are unchanged , compatible with scarring . No acute osseous abnormalities identified .
    OUTPUT:
    
Mild pulmonary vascular congestion , improved from the previous exam , without focal consolidation to suggest pneumonia .