The x-ray features of the lower esophageal web differ from both the middle esophageal web and the lower esophageal ring. The proximal end of the web (cephalic end) shows symmetrical expansion of the esophagus and the distal end (esophageal vestibular area) shows a double concave surface. This is one of the clinical manifestations of esophageal webbing and esophageal rings. Esophageal webs and rings are easily confused with esophageal muscle contraction and stricture. Strictly speaking, esophageal webbing is a thin (2-3 mm) and brittle web-like septum consisting only of mucosa and submucosa in the lumen of the esophagus, which can be seen in any part of the esophagus. The esophageal ring often refers to a thick, tough, narrow ring composed of the mucosal and muscular layers of the esophagus. It is difficult to distinguish between the two on X-ray, so the distinction between esophageal webs and rings should be based on symptoms, signs, X-ray signs esophageal manometry and endoscopic biopsy. How to check for symmetrical esophageal enlargement? If upper esophageal webbing is suspected, X-ray examination is required. Eccentric webs less than 2 mm wide can be found on the lateral anterior wall of the upper esophagus, and more than one is rare. On endoscopy, the web is a smooth, colored, eccentrically open septum-like hole located below the level of the cricopharyngeal muscle, and some of the membrane webs are too thin to be detected by the examiner. Rarely, a thick, rigid web that prevents the passage of food is present. Because approximately 70% of patients with oral cancer have a long history of Plummer-Vinson syndrome, endoscopic cytobrush or biopsy of the esophageal webs is necessary to exclude inflammatory strictures or cancer. In addition, 30% to 50% of patients with Plummer-Vinson syndrome are complicated by pernicious anemia, atrophic gastritis, mucinous edema, and in some patients, antibodies to thyroid or gastric lining cells can be detected in the blood, which can be easily distinguished from other webs and rings. The middle esophageal web, unlike the former, has no obvious gender differences and is mostly asymptomatic, or if it does, its only symptom is dysphagia. The X-ray features of the lower esophageal web are different from both the middle esophageal web and the lower esophageal ring, with the proximal end of the web (cephalic end) showing symmetrical expansion of the esophagus and the distal end (esophageal vestibular area) showing a biconcave surface. The patient is placed in the lateral position for Valsalva maneuver, which expands the esophageal lumen above and below the lower esophageal ring, making it easy to show the ring and thus locate and measure its diameter. It is characterized by a double concave surface proximal to the ring and distal to the stomach, as opposed to the lower esophageal web. During esophagoscopy, the lower part of the esophagus is inflated to fully inflate before the esophagus is clearly visible and biopsied under blind vision to exclude diseases such as esophagitis and esophageal cancer.