I. Symptoms of kidney cyst: 1: Discomfort or pain in the waist and abdomen. 2: Hematuria: It can be manifested as microscopic hematuria or meatus hematuria. The attacks are cyclical. Back pain often increases during the attack, and can be triggered or aggravated by strenuous exercise, trauma, and infection. 3: Abdominal mass: Sometimes it is the main reason for patients to visit the clinic. 60% to 80% of patients can palpate the enlarged kidney. Generally speaking, the larger the kidney is, the worse the kidney function is. Zheng Zhaomin, Department of Minimally Invasive Oncology, Shandong Qianfo Mountain Hospital 4: Proteinuria: Generally the amount is not much, not more than 2g in 24 hours urine. mostly nephrotic syndrome will not occur. 5: Hypertension: solid cyst presses the kidney, causing renal ischemia, which increases renin secretion and causes hypertension. 6: Renal function decreases: due to the cyst occupancy and compression, the normal kidney tissue is significantly reduced and the renal function is progressively decreased. Minimally invasive treatment of renal cysts: renal cysts less than 4 cm in diameter, no obvious pressure on the renal pelvis and calyces, no infection, malignant transformation, hypertension, or symptoms are not obvious, only need close follow-up observation and regular B ultrasound review. 1. Indications: renal cysts with a diameter of 4 cm or more combined with intracapsular infection. At present, the purpose of treatment can be achieved by minimally invasive interventional treatment, which is simple, safe and effective, and very low cost. Under the guidance of B-ultrasound or CT, the cyst is punctured with a special trocar needle and the cystic fluid is sucked out, then a certain amount of anhydrous alcohol is injected into the cystic cavity to “burn” the epithelial cells secreting cystic fluid on the cystic wall, so that the cyst will become smaller and no longer grow, in case of incompleteness, the treatment can be repeated, usually a single cyst can be treated 1 to 2 times! ! Multiple foci can be treated in stages. 2. contraindications: local skin infections, patients with serious bleeding tendencies. 3. complications: bleeding, infection, hemopneumothorax, kidney lacerations, arteriovenous fistula, injury to the urinary cysts and sclerosing agent extravasation of perinephric tissue irritation and damage.