Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are clear without focal consolidation , effusion , or pneumothorax . Cardiomediastinal silhouette is stable noting mild cardiomegaly . No acute osseous abnormalities , posterior fixation lumbar spinal hardware is partially visualized .
    OUTPUT:
    
Mild cardiomegaly without superimposed acute cardiopulmonary process .