Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest were obtained . Right superior mediastinal widening is similar to ___ and corresponds to tortuous vessels as seen on prior CT . The heart size is normal . Bilateral lungs are clear without focal or diffuse abnormality . An apparent calcified nodule overlying the right lower lung corresponds to a right breast calcification seen on prior CT . A moderate - to - large sized hiatal hernia is again identified as a retrocardiac opacity . The osseous structures are unremarkable . No radiopaque foreign bodies are present .
    OUTPUT:
    
No acute cardiopulmonary process . Moderate - to - large hiatal hernia .