Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest . There is a large hiatal hernia and the intrathoracic stomach may contain a large bezoar . A dual chamber cardiac pacer is seen . The heart is mildly enlarged . There are median sternotomy wires and clips , presumably from a prior CABG procedure . The aortic valve is calcified which suggests aortic stenosis . The lungs are clear without focal opacities , pulmonary edema , pleural effusion or pneumothorax . There is no free air beneath the hemidiaphragms .
    OUTPUT:
    
Very large hiatal hernia may contain a large bezoar . No pneumonia , edema or pleural effusion .