Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest were obtained . There is blunting of the bilateral posterior costophrenic angles suggesting trace pleural effusions . Mild basilar atelectasis is seen . Retrocardiac air - fluid level is again seen , consistent with hiatal hernia . Areas of mid lung atelectasis / scarring are also seen . Surgical clips are noted in the upper quadrant . The cardiac silhouette is top normal to mildly enlarged . Mediastinal contours are unremarkable .
    OUTPUT:
    
1 . Hiatal hernia . 2 . Trace bilateral pleural effusions .