Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are relatively low . Bibasilar opacities are likely secondary to atelectasis . Superiorly , lungs are clear . There is no large effusion or overt edema . The cardiomediastinal silhouette is grossly within normal limits and portable technique and low lung volumes . No acute osseous abnormalities .
    OUTPUT:
    
No definite acute cardiopulmonary process .