Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: DH tube in situ with the tip in the stomach . Swan - Ganz catheter in situ with the tip in the left main pulmonary artery , still within the cardiomediastinal shadow . Post CABG changes with prosthetic aortic valve in situ . Low lung volumes . Right - sided chest drain in situ . Bilateral basal airspace opacification ( most likely atelectasis ) appear similar compared to previous imaging .
    OUTPUT:
    
DH tube in situ with the tip in the stomach .