Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable AP upright chest radiograph ___ at 13 : 53 is submitted .
    OUTPUT:
    
Tracheostomy tube remain in satisfactory position . Left subclavian PICC line unchanged in position . Status post median sternotomy with stable cardiac and mediastinal contours . Bibasilar patchy opacities are not significantly changed given differences in technique between studies most likely representing partial lower lobe atelectasis , although pneumonia should also be considered . Probable layering left effusion . No pulmonary edema . No pneumothorax .