Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: As compared to prior chest radiograph from ___ , lung volumes have decreased , accentuating the cardiac silhouette and bronchovascular structures . There is mild bibasilar atelectasis . Small pleural effusions are seen bilaterally . There is mild calcification of the aortic knob . No pneumothorax or focal consolidation identified . An air - fluid level is seen in the left upper quadrant , within the gastric fundus .
    OUTPUT:
    
Bibasilar atelectasis in the setting of low lung volumes . Small bialteral pleural effusions .