Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are clear without focal consolidation , effusion , or edema . Mild cardiac enlargement is again noted . Additional contour in the retrocardiac region adjacent to the left heart borders compatible with a large hiatal hernia . No acute osseous abnormalities .
    OUTPUT:
    
Hiatal hernia and cardiomegaly without superimposed acute cardiopulmonary process .