Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Patient is status post esophagectomy with gastric pull - up . Compared to ___ , there is decrease in left lung volume and elevation of the left hemidiaphragm , likely due to atelectasis . The right upper lung is clear . Small pleural effusion and associated atelectasis is not significantly changed . Dilated stomach in the mediastinum is seen , the overall mediastinal silhouette appears unchanged from prior . The heart size is difficult to assess , though likely stable . Aortic knob calcifications is unchanged from prior . No pneumothorax seen .
    OUTPUT:
    
New left lower lobe atelectasis . Stable appearance of postop mediastinal silhouette .