Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Dual lumen right - sided subclavian central venous catheter tip terminates in the proximal right atrium . Mild to moderate cardiomegaly is re - demonstrated . Atherosclerotic calcifications are noted at the aortic knob . Mediastinal and hilar contours are unchanged . Mild pulmonary vascular congestion is present . There is a small left pleural effusion , as seen previously , with focal opacity in the left lung base potentially reflective of compressive atelectasis though infection is not excluded . No pneumothorax is detected . There are no acute osseous abnormalities .
    OUTPUT:
    
Small left pleural effusion , similar to the previous study , with continued left basilar opacity potentially reflective of compressive atelectasis but infection can not be excluded .