Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable AP upright chest radiograph ___ at 09 :36 is submitted .
    OUTPUT:
    
Pneumomediastinum and extensive subcutaneous emphysema appears unchanged . Possible small stable right pneumothorax , although this may just represent overlying subcutaneous emphysema . Status post median sternotomy with stable overall cardiac and mediastinal contours . A right internal jugular Port - A - Cath remains unchanged in position . Bibasilar opacities are again seen suggestive of atelectasis , although the appearance is slightly more consolidative at the left base raising concern for developing pneumonia . No pulmonary edema .