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 1 X-ray and thoracic computed tomography imaging of the patient. A and B: A barium meal X-ray revealed poor relaxation of the distal sphincter, dilatation of middle esophageal and stenosis of lower esophagus, weakened esophageal peristalsis, and ultimately stricture of the esophageal lumen with a beak-like appearance; C and D: Thoracic computed tomography imaging revealed thickening of the esophageal wall and antrum stricture (arrows), with a regular mucosal pattern.