Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest demonstrate an unchanged moderate - sized hiatal hernia . The lungs are well expanded and clear , with interval decrease in size of a now small right pleural effusion with residual right lower lung atelectasis and / or scar . The cardiac silhouette and mediastinal contours are unchanged .
    OUTPUT:
    
1 . Interval decrease in now small right pleural effusion with adjacent atelectasis and / or scar . 2 . Moderate hiatal hernia may explain the patient 's chest pain .