Abnormally increased uptake of lower-FDG in multiple right inguinal lymph nodes adjacent to the iliac vessels bilaterally, with a maximum SUV of 22.12, suggests abnormal metabolism in the right inguinal lymph nodes, possibly due to malignancy. FDG is a contrast agent, which refers to fluorodeoxyglucose. After injecting FDG into a patient, if a disease occurs in the organism, such as inflammation or a tumor, the uptake of FDG by the organism will increase significantly, and when scanning with PET-CT, it is able to construct an image reflecting the distribution of FDG in the body, which makes it possible to determine whether or not a disease has occurred in the organism. In clinical practice, the SUV value is generally used to reflect the uptake of FDG, and the higher the SUV, the higher the likelihood of malignant tumors. If the SUV of the right inguinal lymph node is 22.12, it is generally suggestive of malignant tumors, and further diagnosis and treatment are required, such as biopsy, etc, to make a clear diagnosis in general.