Contrast-enhanced ultrasound using SonoVue mixed with oral gastrointestinal contrast agent to evaluate esophageal hiatal hernia: Report of three cases and a literature review

Figure 2 Measurement of the esophageal hiatus and the hernial sac. The schematic diagram shows the measurement of the esophageal hiatus with fine-head arrows and the hernial sac with solid-head arrows. HS: Hernial sac; ST: Stomach.