Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Focal opacity at the left cardiophrenic angle is thought to be due to a fat pad or atelectasis , unchanged . The lungs are otherwise clear without focal consolidation , effusion , or pneumothorax . Cardiomediastinal silhouette is within normal limits . There is tortuosity of the descending thoracic aorta . No acute osseous abnormalities .
    OUTPUT:
    
No acute cardiopulmonary process .