Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Large loculated left pleural effusion has decreased in size and is now moderate to large . There has been associated improved aeration within the left upper lobe but significant atelectasis persists , particularly in the left lower lobe and lingula . Mild pulmonary vascular congestion is present and accompanied by interstitial pulmonary edema . Indwelling devices are unchanged in position .
    OUTPUT:
    
Decrease in size of loculated left pleural effusion with associated improved aeration in the left upper lobe .