Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: As on prior , low lung volumes are seen . There has , however , been interval clearance of the retrocardiac opacity seen on the previous lateral view . Cardiomediastinal silhouette is unchanged and likely within normal limits given positioning and low lung volumes . No acute osseous abnormality is identified .
    OUTPUT:
    
Limited exam given low lung volumes ; however , no evidence of large confluent consolidation .