Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral chest radiographs demonstrate improved lung volumes when compared with prior , though they are not hyperexpanded . There is a small airspace opacity posteriorly in the right lower lobe likely due to atelectasis . There is no effusion or pneumothorax . The pulmonary vasculature is normal . The heart size is top normal , and apparently increasing compared with ___ . The mediastinal contours are unremarkable .
    OUTPUT:
    
1 . No acute chest pathology . 2 . Top normal heart size , increasing in size compared with ___ . The can be physiologic if the patient is pregnant ( though we were not alerted to that ) ; otherwise increase in heart size warrants evaluation . These findings were e-mailed to the ED QA nurses .