Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lung volumes are low , with bibasilar atelectasis . The cardiomediastinal and hilar contours are stable , with a mildly tortuous thoracic aorta with atherosclerotic calcification in the aortic knob . Pleural effusions , if any , are small . Small right sided pleural effusion is difficult to exclude . There is no pneumothorax . Old healed left posterior rib fractures are seen .
    OUTPUT:
    
Low lung volumes with bibasilar atelectasis . Difficult to exclude small right pleural effusion . No definite evidence of pneumonia . If there is continued clinical concern for the same , repeat radiograph in PA and lateral projections would be helpful .