Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Blunting of the right lateral costophrenic angle is compatible with small pleural effusion as seen on prior . The lungs are otherwise clear . The cardiomediastinal silhouette is within normal limits . No acute osseous abnormalities .
    OUTPUT:
    
No acute cardiopulmonary process . Persistent small right pleural effusion .