The main difference between enhanced CT and normal CT is whether a contrast enhancer (e.g., organic iodine agent) is injected during the scan. Enhanced CT refers to the injection of water-soluble organic iodine agent (e.g., 60% to 76% pantothenic glucosamine) intravenously during the scan. When the concentration of iodine in the blood increases, the concentration of iodine in the organ and the lesion can differ, forming a density difference that will make the lesion appear more clearly during the CT scan and can show the interrelationship between the lesion and the blood vessels very clearly. If the density of the lesion is very close to the density of the surrounding tissue, plain CT will not be able to show the boundary between the lesion and the surrounding tissue clearly. The time to choose enhancement CT examination is mainly for those patients who are likely to receive surgical treatment and need to understand the relationship between the local tumor and surrounding tissues and important blood vessels in detail before surgery, which is very helpful for doctors to judge the patient’s condition and formulate treatment plans.