Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable semi-upright radiograph of the chest demonstrates very low lung volumes with resulting bronchovascular crowding . There are persistent bilateral parenchymal peribronchial opacities , which is improving from the prior study . The heart size is normal . The cardiomediastinal and hilar contours are unchanged , consistent with known mediastinal and hilar lymphadenopathy . There is no pneumothorax , pleural effusion , or pulmonary edema . Right subclavian central venous line ends at the mid-SVC .
    OUTPUT:
    
Interval improvement of bilateral parenchymal opacities . No pulmonary edema .