Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is chain suture at the right apex and a surgical clips at the left apex . The lungs are slightly hyperexpanded . The cardiomediastinal silhouette and hilar contours are stable . There is no cardiomegaly . There is no large pleural effusion or pneumothorax . Apical thickening is stable . Well circumscribed opacity in the retrocardiac region on the lateral radiograph anterior to the aorta is likely a distended lower esophagus with retained enteric material or a hiatal hernia . Chronic left rib fractures are redemonstrated .
    OUTPUT:
    
Well circumscribed opacity in the retrocardiac region likely reflects distended lower esophagus with retained food or a hiatal hernia . No evidence of pneumonia . Updated results telephoned to Dr . ___ by ___ at 8 : 50 am , ___ , 30 minutes after discovery .