I. Overview of the disease Kidney, commonly known as waist, kidney cancer accounts for about 80% to 90% of malignant tumors of kidney, mostly seen in men over 40 years old. Kidney cancer can occur in any part of the kidney. The tumor can gradually grow and invade the renal pelvis, calyces and ureter. It can also invade renal vein and form renal vein, inferior vena cava and even right atrium cancer thrombus, which can spread to perinephric tissues and form distant metastasis through blood and lymph. The early stage of kidney cancer is often asymptomatic, and its typical three major manifestations are hematuria (blood in urine), abdominal mass and low back pain. Hematuria indicates that the tumor has invaded the blood vessels or renal pelvis and calyces, marking the progressive stage of the disease. Kidney cancer can produce many hormones and hormone-like substances and cause various symptoms, including: 1) erythropoietin can cause erythrocytosis; 2) parathyroid-like hormone can cause hypercalcemia; 3) renin can cause hypertension; 4) adrenal glucocorticoids can cause Cushing syndrome. The diagnosis of kidney cancer mainly relies on clinical manifestations and related examinations. X-ray is of little diagnostic value; after the tumor invades the renal calyces and renal pelvis, intravenous pyelogram can show the deformation and dilatation of the renal calyces and renal pelvis caused by pressure and erosion. CT is an indispensable means to diagnose kidney cancer, which can show the size, location, invasion range, lymph node enlargement, intravenous cancer thrombus and metastasis of adjacent organs, etc. MRI plays an important role in the diagnosis and correct staging of kidney cancer, which can show the size, location, invasion range, lymph node enlargement, intravenous cancer thrombus and metastasis of adjacent organs. MRI is also helpful in understanding the relationship between kidney cancer and surrounding organs and structures, and can be used to observe whether kidney cancer has invaded the surrounding organs and structures from different planes. Renal arteriography is an important method to diagnose neoplastic kidney disease and becomes an important part of interventional radiological diagnosis and treatment. Abdominal aortography and selective renal arteriography can provide information for the selection of treatment plan and provide guidance for interventional treatment. Radical surgical resection is the first choice of treatment for kidney cancer, other treatments include interventional therapy, hormone therapy, chemotherapy and immunotherapy. The advantages of embolization of renal artery before surgery mainly lie in reducing intraoperative bleeding and the possibility of tumor metastasis through veins. 24-72 hours after embolization of renal artery, edema occurs between the embolized tumor and kidney, and the interface of kidney is clearly shown, which is conducive to the peeling and complete removal of tumor. 2.Simple interventional therapy is the palliative treatment for patients with advanced renal cancer who are not indicated for surgery or unwilling to undergo surgery. The purpose is to infarct the tumor, which can control or relieve the serious symptoms caused by the tumor, shrink the tumor, stabilize and improve the general condition, and slow down the growth rate of the tumor. Usually, femoral artery puncture is used for abdominal aortography or selective renal artery angiography. After observing the angiographic manifestations, selective and super-selective infusion of chemotherapeutic drugs and embolization of tumor-related vessels are performed. Embolization can be classified as permanent or temporary, complete or incomplete. Commonly used embolization agents include: anhydrous alcohol, gelatin sponge, Chinese medicine splenda powder, steel ring and iodine oil + anticancer drugs, etc. Complications and treatment: 1. Post-embolization syndrome includes back pain, low fever, nausea and vomiting on the embolization side, which is generally mild and can be recovered within a short period of time by symptomatic treatment. 2.Ectopic embolism Due to the poor visibility of embolization material under X-ray or the existence of collateral traffic vessels, the embolization material enters other parts and forms ectopic embolism. For the milder ectopic embolism, with symptomatic treatment, generally no serious consequences. In rare cases, embolization of spinal cord blood supply artery may produce serious consequences such as lower limb paralysis and urinary and fecal incontinence. For those who have large arteriovenous fistula, there is a possibility of pulmonary embolism. V. Health care and rehabilitation As palliative treatment, it means that the tumor cannot be cured, and further chemotherapy or other treatments are needed. After embolization of one side of the renal artery, attention should be paid to protect the function of the other side of the kidney, drink more water, and avoid using drugs that affect kidney function.