Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable AP upright chest radiograph was obtained . The lungs are low in volume with diffuse reticular opacities , confluent more peripherally and more pronounced basally , which is consistent with pulmonary fibrotic disease . In the absence of prior examinations , it is difficult to assess if a given area has focally increased to reflect an acute change secondary to either infection or fluid accumulation . However , prominence of the pulmonary and mediastinal vasculature in this context suggests mild edema . Heart size is top normal with normal aortic contours .
    OUTPUT:
    
Severe interstitial abnormality could reflect pulmonary fibrosis though in the absence of prior examinations it is difficult to determine the presence of an acute change ; however there may be mild pulmonary edema .