Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There has been no interval change from the previous study . Cardiac , mediastinal and hilar contours are within normal limits . Lungs are clear . No pulmonary vascular congestion is seen . No pleural effusion or pneumothorax is present . There are no acute osseous abnormalities .
    OUTPUT:
    
No acute cardiopulmonary abnormality . No interval change from the previous chest radiograph obtained approximately 4 .5 hr earlier .