Use of tunnel endoscopy for diagnosis of obscure submucosal esophageal adenocarcinoma: A case report and review of the literature with emphasis on causes of esophageal stenosis

Figure 3 High-resolution esophageal manometry. The integrated relaxation pressure (4s integrated relaxation pressure; normal reference value: 15 mm Hg) was 26.6 mm Hg which suggested relaxation dysfunction of the lower esophageal sphincter.