Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lung volumes are low . There are vague basilar opacities , most consistent with bibasilar atelectasis . The lungs are otherwise clear without consolidation or edema . There is no pleural effusion or pneumothorax . The bilateral hila are prominent . The hila were previously evaluated on the prior CT , and appear prominent due to the configuration of the normal vasculature . The mediastinal contours are normal . The heart size is normal .
    OUTPUT:
    
Probable bibasilar atelectasis . Otherwise , no acute cardiopulmonary process .