Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac , mediastinal and hilar contours are normal . Pulmonary vasculature is normal . Lungs are clear . No pleural effusion or pneumothorax is demonstrated . There are no acute osseous abnormality . Rounded density within the anterior aspect of the right upper quadrant of the abdomen may reflect a calcified gallstone .
    OUTPUT:
    
No acute cardiopulmonary abnormality .