Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest were obtained demonstrating clear well - expanded lungs without focal consolidation , effusion , or pneumothorax . Heart size is normal . Mediastinal contour unremarkable . Bony structures intact . No free air below the right hemidiaphragm . There is a mildly prominent retrocardiac density which is compatible with known hiatal hernia .
    OUTPUT:
    
No acute intrathoracic process .