Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Right - sided double lumen central venous catheter tip terminates in the proximal right atrium . Heart size is mildly enlarged . The mediastinal and hilar contours are unremarkable . Pulmonary vasculature is not engorged . Aeration of the lungs has markedly improved compared to the previous radiograph , with patchy opacities demonstrated in the lung bases , potentially infectious or atelectasis . No pleural effusion or focal consolidation is present . No acute osseous abnormalities detected .
    OUTPUT:
    
Patchy opacities in the lung bases may reflect atelectasis however infection is not excluded .