Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a dual - lumen left internal jugular central venous catheter terminating in the upper atrium , as before . The course of the catheter appears unchanged . The heart is normal in size . There is increased interstitial opacification , suggesting mild vascular congestion . In the left lower lobe , a prominent flat but prominent opacity is most suggestive of atelectasis , although an infectious process is difficult to entirely exclude . There is no pleural effusion or pneumothorax . Bony structures are unremarkable .
    OUTPUT:
    
Unchanged appearance of central venous catheter . Mild vascular congestion . New left lower lobe opacification , not entirely specific , but most suggestive of atelectasis .