Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable semi-erect chest radiograph ___ at 09 :54 is submitted .
    OUTPUT:
    
Right chest tube remains in place stable postoperative changes in the right hemi thorax . No definite pneumothorax is seen on the semi upright study . Increasing patchy opacity at the right medial lung base and patchy opacity at the left lung base likely reflect atelectasis , although aspiration or pneumonia should also be considered . No pulmonary edema . Numerous bilateral pulmonary nodules a better appreciated on the recent chest CT dated ___ . Overall cardiac and mediastinal contours are stable .