Density shadow in upper esophagus is a professional term used in CT examination. Generally, density shadow in upper esophagus is commonly seen in hematoma, foreign body in esophagus, esophageal cancer, and so on. 1. Hematoma: Patients may have hematoma when the esophagus is damaged due to trauma, injury when swallowing food or gastroscopy, etc. At this time, CT examination will suggest abnormal density shadow in the upper esophagus. 2. Esophageal foreign body: If the patient does not pay enough attention to the food in daily life and accidentally eats some substances such as nucleus, metal objects, fish splinters, etc., which are stuck in the esophagus, the CT examination will also indicate abnormal density shadow, which needs to be judged according to the condition and the shape of the density shadow. 3. Esophageal cancer: some patients with esophageal cancer may have tissue hyperplasia or lumps or occupying lesions in the esophagus, and CT examination at this time will indicate high density shadow. Dense shadow in the upper esophagus during CT examination can also be seen in other cases, such as implantation of instruments after endoscopic surgery. It is recommended to actively consult the doctor, improve the examination, clarify the cause of the disease, and treat the symptoms.