Esophageal cancer is a common and frequent tumor in China, and also the country with the highest mortality rate. Although the etiology of esophageal cancer is not very clear, from the analysis of various data, esophageal cancer is caused by a variety of compound factors, such as lack of certain trace elements and vitamins, poor dietary hygiene habits such as long-term consumption of acid, hard and overheated food, etc. Although our province is not a region with high incidence of esophageal cancer, it is easy to see it in clinical treatment. Esophageal cancer diagnosis? 1.Clinical manifestations: Early esophageal cancer generally has no special symptoms, but with the progress of the disease, symptoms such as progressive dysphagia, painful swallowing, and discomfort behind the sternum may appear, and in advanced stage, enlarged lymph nodes on the left clavicle may be palpable. 2.Auxiliary examinations: A: esophageal X-ray barium meal examination can see signs such as stiffness of esophageal mucosa, mucosal interruption, irregular filling defect, distortion and even barium shunt, which can better show the site and length of the lesion. B: Esophagoscopy: the shape and size of the lesion can be visualized, and the pathological classification and grading can be obtained by taking material for pathological examination. C: CT (or MRI) comprehensive literature reports: esophageal CT or MRI examination can clearly show the relationship between the esophagus and the adjacent mediastinal organs to maximize the understanding of whether the lesion is invasive and lymph node metastasis around the esophagus, providing reliable assurance for the selection of treatment options (surgery, radiotherapy) and radiotherapy program design. To make up for the deficiency of barium X-ray examination of the esophagus.