Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest are compared to previous exam from ___ . Relatively low lung volumes are seen with linear bibasilar opacities suggestive of atelectasis . Superiorly , the lungs are clear . Cardiomediastinal silhouette is within normal limits . Osseous and soft tissue structures are unremarkable . There is no free intraperitoneal air below the diaphragm .
    OUTPUT:
    
No definite acute cardiopulmonary process . Probable bibasilar atelectasis given lower lung volumes .