Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable semi-upright radiograph of the chest demonstrates low lung volumes with resultant bronchovascular crowding . Pulmonary edema is superimposed on diffuse granular interstitial pulmonary abnormality , which may represent infectious process or drug reaction . Cardiomediastinal and hilar contours are unchanged . No pneumothorax , pleural effusion , or consolidation .
    OUTPUT:
    
Pulmonary edema is superimposed on diffuse granular interstitial pulmonary abnormality , which may represent infectious process or drug reaction .