Patient: Description of the condition (onset time, main symptoms, hospital visited, etc.): Left renal malformation tumor 0.8*0.8 was found during physical examination, and after one month, it was rechecked in hospital that both left and right malformation tumors were found, 1.0*0.9 on the left and 0.5*0.5 on the right. Tianjin Cancer Hospital, Department of Interventional Therapy, Tongguo Si: Malignant tumor is a common benign kidney tumor, and it can be left alone when the tumor is small. However, multiple malignant tumors in both kidneys are rare. We suggest you to perform enhanced CT examination of both kidneys to clarify the size and number of lesions. If it is determined to be multiple foci in both kidneys with pain and discomfort or renal function impairment, it is recommended to receive interventional embolization treatment, which can control the growth of tumor while protecting renal function, and the procedure is less invasive and easily tolerated by patients.