Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a decreased caliber of the mediastinum compared with the prior study from ___ . Heart is normal size . The hila are unremarkable . Linear atelectatic changes in the left lung are again seen , however with improved left lung aeration since the prior exam . There is no focal lung consolidation . There is decreased vascular engorgement compared to the prior study . There is no pulmonary edema . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
1 . Decreased caliber of the mediastinum with persistent postop anterior mediastinal fluid select , likely slowly resolving and now redistributed . 2 . Persistent linear atelectatic changes in left lung , however with improved aeration compared with the prior study . No focal lung consolidation . 3 . Decreased vascular engorgement since the prior study . No edema .