Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The right IJ central venous catheter ends in the proximal right atrium . There is no evidence of pneumothorax . Cardiomediastinal silhouette is normal . Lung volumes are low with increased opacification at the bilateral lung bases left greater than right , which may represent a combination of atelectasis and pleural fluid .
    OUTPUT:
    
Right IJ central venous catheter ends in the proximal right atrium . No evidence of pneumothorax .