Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral radiographs of the chest demonstrate asymmetric lung volumes due to elevation of the right hemidiaphragm . Otherwise , the lungs are clear with no focal opacity . The cardiac contour is top normal . The mediastinal and hilar contours are normal . No evidence of heart failure . No pleural abnormality .
    OUTPUT:
    
Mild cardiomegaly with no evidence of heart failure , aspiration , or pneumonia .