Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable chest radiograph demonstrates low lung volumes with left basilar atelectatic changes and a possible small effusion . The heart size is normal . When compared to prior chest film ___ , there is much improved pulmonary edema . No new focal consolidation . A right jugular line and is low in the superior vena cava . No pneumothorax .
    OUTPUT:
    
Substantially improved pulmonary edema . Left basilar atelectatic changes with possible small effusion .