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Figure 2: On the axial computed tomographic section view of the case without hiatal hernia; (a) the white arrows show the hiatus oesophagus and (b) the red arrows show the HSA measurement made at this level using the freehand region of interest method

Figure 2: On the axial computed tomographic section view of the case without hiatal hernia; (a) the white arrows show the hiatus oesophagus and (b) the red arrows show the HSA measurement made at this level using the freehand region of interest method