Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes remain low . Slight interval improvement in left lower lobe atelectasis compared to the prior exam . Heart size is probably mildly enlarged with mild central pulmonary vascular congestion and minimal edema , also probably slightly better from the prior exam . No pleural effusion or pneumothorax . Mediastinal clip projects over the left mid hemithorax , unchanged .
    OUTPUT:
    
1 . Low lung volumes with slight interval improvement a left lower lobe atelectasis . 2 . Minimal edema and pulmonary vascular congestion , improved .