As people become more aware of health checkups, people are often found to have liver cysts or kidney cysts during ultrasound exams. So what is a cyst? What should I do if I have a cyst? Cysts, commonly known as “blisters”, are mostly caused by some abnormalities in congenital development, while acquired factors are less common. It is a benign tumor and generally does not pose a risk to human life, but if the cyst is too large, it will definitely show symptoms of compression and, over time, will affect the function of the organ. Usually cysts less than 5cm are asymptomatic, so no treatment is needed, you just need regular ultrasound examinations to observe its changes. While cysts larger than 5cm can cause complications due to compression of surrounding organs or important structures, such as liver cysts compressing bile ducts causing bile duct dilatation; kidney cysts compressing renal artery or renal pelvis causing secondary hypertension or hydronephrosis; larger cysts on the surface of liver and kidney even have the risk of rupture. At this point, treatment is required as needed. The traditional method is surgical treatment. Ultrasound intervention is now widely used in clinical practice. Ultrasound-guided puncture and aspiration treatment for liver and kidney cysts is to select the shortest and safest path under ultrasound monitoring, use a fine needle to accurately pierce the cyst through the skin, aspirate the cyst fluid, and then inject anhydrous alcohol according to the nature of the intracapsular fluid to make the cyst sclerosis and no longer grow. It is a minimally invasive treatment that feels almost equivalent to a single subcutaneous injection, with an average outpatient treatment time of about 30 minutes to go home the same day of treatment, and usually no medication changes or other treatments after surgery. The treatment effect is observed by ultrasound 3 to 6 months after surgery. Ultrasound-guided interventional treatment of liver and kidney cysts has completely replaced the traditional surgical treatment. It is less traumatic, less painful and less expensive, and can achieve the same effect as surgical dissection under minimally invasive conditions, and is even safer and more effective than surgery for some special parts of lesions that are not suitable for surgery. The application of this treatment method is becoming more and more widespread and popular, and the ultimate beneficiaries are the majority of patients.