Esophagus showing very low density foci is mainly a description of the imaging examination, most often consider the presence of cysts, hemangiomas, tumors and other diseases in the esophagus area. Extremely low density foci in the esophagus are foci that are found to be less dense than the surrounding tissues during X-ray, CT, and other imaging examinations, showing abnormalities, usually containing gas or liquid, and are most commonly seen in esophageal cysts, esophageal hemangiomas, esophageal tumors, and other lesions. Patients are usually accompanied by symptoms such as dysphagia, painful swallowing, and heartburn. However, when extremely low density foci are found in the esophagus, the specific disease and the nature of the disease cannot be determined, and further endoscopy and pathologic histologic biopsy are needed to confirm the diagnosis of the disease. When the patient’s esophagus shows extremely low density foci, it is recommended to consult a doctor in time, and further improve the examination under the guidance of the doctor to clarify the cause of the disease, so as to avoid delaying the condition.