Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There has been interval removal of the right central line and IVC filter . Elevation of the left hemidiaphragm with minimal subsegmental atelectasis persists though appears improved from prior . No confluent opacity is identified to suggest pneumonia . There is no pneumothorax . A calcified granuloma in the right lower lobe appears similar to prior .
    OUTPUT:
    
Improved aeration of the left lung base , with mild persistent atelectasis . No evidence of acute pneumonia .