Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Since the chest radiographs obtained ___ , there is new , mild cardiomegaly . Lungs are fully expanded and clear without consolidations or effusions . Heart size is normal . Cardiomediastinal and hilar silhouettes are normal . Pleural surfaces are normal .
    OUTPUT:
    
No radiographic evidence of pneumonia . Mild cardiomegaly is new since ___ .