Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post coronary artery bypass graft surgery . A PICC line has been removed . Rightward shift of mediastinal structures is partly positional but suggests there may be atelectasis with volume loss at the right lung base to some degree . The pulmonary vasculature is hazy and mild vascular congestion is suspected . It is difficult to exclude pleural effusions , at least of small size . The bones are probably demineralized .
    OUTPUT:
    
Findings suggesting right basilar atelectasis and mild vascular congestion .