Mild enhancement after enhancement is not necessarily cancer. In the so-called enhanced CT or MRI examination, CT or MRI scan is performed first, and contrast agent is injected into the patient intravenously. After a period of time, the patient is scanned again, and the nature of the lesion is initially judged by comparing the density change of the lesion after the two scans before and after. Malignant tumors have a higher density of blood vessels than normal tissues, and their absorption of contrast agent is also higher than normal or benign lesions, so the density of the lesion increases significantly after enhancement, that is, the enhancement is obvious. Some inert tumors, that is, slow-growing tumors, such as follicular lymphoma, do not have significant enhancement after enhancement, that is, mild enhancement; while some benign lesions, such as inflammation, may also have mild enhancement after enhancement because the inflammatory process is also accompanied by increased blood supply. Therefore, regardless of whether the enhancement is mild or obvious, imaging examination can only be used as an auxiliary diagnostic tool, and the most accurate method to distinguish benign from malignant is still pathological biopsy.