Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable semi-erect chest radiograph ___ at 05 : 15 is submitted .
    OUTPUT:
    
The patient is rotated limiting evaluation of the cardiac and mediastinal contours . The heart remains upper limits of normal in size . There are streaky linear opacities at the left base favoring atelectasis . A more patchy opacity at the right base also could reflect atelectasis , although pneumonia or aspiration should also be considered . No pulmonary edema . No pneumothorax .