Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Previously seen opacities are now resolved , the lungs are clear bilaterally . Cardiomediastinal silhouette remains largely unchanged . There is no pleural effusion or pneumothorax . Hiatal hernia is seen , but is best characterized on CT abdomen / pelvis dated ___ .
    OUTPUT:
    
Resolution of bilateral opacities seen previously