Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable radiograph of the chest demonstrates improved lung volumes from the prior study . There are mild atelectatic changes at the bilateral bases , left greater than right . A PICC line is seen with the tip terminating in the mid-SVC . There is no pneumothorax or pleural effusions . The cardiomediastinal and hilar contours are unremarkable .
    OUTPUT:
    
There are mild atelectatic changes at the bilateral bases , left greater than right .