Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable semi-erect chest radiograph ___ at 11 :44 is submitted .
    OUTPUT:
    
Since the previous study , the pulmonary vasculature has become more ill - defined consistent with interval appearance of mild interstitial edema . Bibasilar patchy opacities have also slightly increased favoring lower lobe patchy atelectasis , although aspiration or pneumonia should also be considered . Overall cardiac and mediastinal contours are unchanged . No pneumothorax , although the sensitivity to detect pneumothorax is diminished given semi upright technique . No large effusions .