Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A portable frontal chest radiograph again demonstrates multiple sternotomy wires , a mitral valve replacement , a Swan - Ganz catheter with the tip in the right pulmonary artery , and a left chest tube . The right pneumothorax is slightly decreased . The left pneumothorax is no longer appreciated . The remainder of the exam is grossly unchanged , with slight improvement of bibasilar atelectasis .
    OUTPUT:
    
Decreased right pneumothorax . No appreciable left pneumothorax .