Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared with prior radiographs , the cardiomediastinal silhouette has returned to preoperative appearance on radiographs on ___ . There is a tiny right pleural effusion . The lungs are clear without focal consolidation . No pneumothorax . Again seen is a hiatal hernia .
    OUTPUT:
    
Cardiomediastinal silhouette is similar to preoperative appearance . Tiny right pleural effusion .