Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size , cardiomediastinal silhouette and hilar contours are normal . A right - sided PICC is unchanged in position with the tip projecting over the lower SVC . There is mild right lower lobe atelectasis . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
Right lung base atelectasis without significant change since ___ .