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Fig. 1A. —Classification of hiatal hernias. Drawing of type 1 sliding hiatal hernia shows esophagogastric junction (thick straight arrow) displaced into thorax. Phrenicoesophageal membrane (arrowheads) is circumferentially weakened and stretched without focal defect. Note endothoracic and endoabdominal fascia (thin straight arrows) and peritoneum (curved arrow).