Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There are no significant interval changes compared to the prior radiograph performed yesterday evening . Endotracheal tube terminates 5 .2 cm above the carina . There is a left pectoral pacer with leads terminating in the right atrium and right ventricle . Otherwise , the lung volumes are still low . Unchanged appearance of left lung base atelectasis . There is no pneumothorax . Cardiomediastinal silhouette is stable . Atherosclerotic calcifications are noted in the aortic arch . Patient is status post left shoulder arthroplasty .
    OUTPUT:
    
1 . No significant interval change compared to the prior radiograph . 2 . Left lung base atelectasis .