Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP view choose of the chest provided . Lungs are hyperinflated . There is minimal bibasilar atelectasis . Right midlung calcified nodule is again seen . Pulmonary vasculature is normal . Heart size is slightly larger since prior study . There are no large pleural effusions . Old healed right rib fracture is again seen . There is no pneumothorax . Retrocardiac opacity likely reflects hiatal hernia .
    OUTPUT:
    
1 . No pneumothorax . 2 . Probable hiatal hernia . Lateral chest radiograph may be obtained for confirmation .