Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single AP portable view of the chest . No prior . There is linear opacity at the right lung base most suggestive of atelectasis . Elsewhere , the lungs are clear , without visualized effusion or pneumothorax . The cardiomediastinal silhouette is within normal limits . The osseous and soft tissue structures are unremarkable .
    OUTPUT:
    
No acute cardiopulmonary process .