The entrance to the esophagus is about 15 centimeters from the incisors, at the junction of the esophagus and the pharynx, and is the first physiologic narrowing of the esophagus. The esophagus is the passageway for food to enter the stomach and is formed by a strip of muscle tissue about 15 centimeters from the incisors. This passageway will connect the pharynx as well as the stomach, and within the human chest cavity, the esophagus serves to take the food that the body swallows through the mouth and deliver it directly to the stomach. Benign masses and malignant masses of the esophagus can be found at the entrance of the esophagus. Since the entrance of the esophagus is the first physiological narrowing of the esophagus, it is very easy for foreign bodies to become embedded in the esophagus. Therefore, when patients have abnormalities at the esophageal inlet, they should go to the hospital for relevant examinations in a timely manner to avoid delaying the condition and causing adverse consequences.