Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A dialysis catheter terminates in the upper right atrium . The cardiac , mediastinal and hilar contours appear unchanged . There is a small to moderate effusion on the left with volume loss including elevation of the left hemidiaphragm and opacity probably due to atelectasis . A diffuse mild interstitial abnormality suggests mild congestion that is new since the prior examination . There is no evidence for free air or pneumomediastinum . Mild degenerative changes are similar along the mid thoracic spine . The lateral view depicts a TIPS shunt .
    OUTPUT:
    
Findings suggesting mild vascular congestion with a left - sided pleural effusion and probable associated atelectasis .