Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable semi-erect chest radiograph ___ at 07 : 57 is submitted .
    OUTPUT:
    
Right internal jugular central line unchanged in position . Overall cardiac and mediastinal contours are stable given differences in positioning . Patchy opacities at both lung bases are likely unchanged and may reflect patchy atelectasis , although pneumonia or aspiration should also be considered . No pulmonary edema . No obvious pneumothorax .