Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest are obtained . Clips in the right and left neck are noted . Bilateral small pleural effusions are seen . In addition , a retrocardiac opacity is seen which most likely reflects the presence of a hiatal hernia . The lungs are otherwise clear . Cardiomediastinal silhouette appears normal . No signs of CHF . Calcific densities project over the upper lungs which likely represent vascular calcifications . The bony structures appear intact .
    OUTPUT:
    
Small bilateral pleural effusions . Retrocardiac opacity likely represents a hiatal hernia . No signs of CHF or pneumonia .