Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient has been extubated since the previous exam . The right hemodialysis catheter ends in the right atrium . There is a new retrocardiac density with volume loss , mostly compatible with atelectasis . There is also a mild right lung base atelectasis . The cardiac and mediastinal contours are normal . New very mild left pleural effusion . There is no pneumothorax .
    OUTPUT:
    
Progression of the left lower lung atelectasis without other significant change .