Cystocentesis is a commonly used treatment method in clinical practice. Generally speaking, the specific steps are as follows: 1. Firstly, locate the position of the cyst by color ultrasound. The local skin at the puncture point is routinely sterilized and a sterile towel is spread.2. After the local infiltration anesthesia is satisfied, a small incision of 3mm is made in the skin, and the puncture needle is slowly inserted through the skin incision. Under the guidance of color ultrasound, the cyst is entered into the interior of the cyst, avoiding damage to the important blood vessels and nerves during the period.3. 10 ml of cystic fluid is aspirated and sent to the bacterial culture for examination. If the size of the cyst is large, it is necessary to insert an abdominal drainage tube to continuously drain the cystic fluid.