Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are hypoinflated with crowding of vasculature . Vertical linear retrocardiac opacity is stable . No pleural effusion or pneumothorax . Heart size , mediastinal contour , and hila are unremarkable . A right hemodialysis catheter tip is in the right atrium . 1
    OUTPUT:
    
Linear retrocardiac opacity is most consistent with atelectasis . Clinical correlation is recommended to assess for superimposed pneumonia .