Many patients with gynecologic malignancies are told they have lymphatic cysts when they have a post-operative follow-up ultrasound. What is lymphatic cyst and does it matter? The following is a brief introduction on lymphatic cysts. There are two sets of circulation in human body, one is blood circulation and the other is lymphatic circulation. A part of gynecological malignant tumor is metastasized through lymph. Therefore, during surgery, pelvic lymph nodes need to be removed to clarify the presence of lymph node metastasis and to cut off their metastatic pathways. Like blood, if a blood vessel is cut off, it will bleed, so if lymph nodes are removed and lymphatic vessels are cut off, “lymphatic fluid” will come out. Lymphatic fluid does not leak out as fast as blood, and there is not a lot of it at once. It is produced and absorbed at the same time. Only when the rate of exudation is greater than the rate of absorption, it will accumulate and become a cyst. Since pelvic lymph node dissection is bilateral, lymphatic cysts are mostly seen bilaterally. So is there a relationship between lymphatic cysts? Many patients ask this question. Generally speaking, after a lymphatic cyst is formed, it will slowly increase in internal pressure as it increases in size, and some thin patients will feel for themselves a mass near the groin or in the lower abdomen. When the pressure is high enough, the patient will have a feeling of distension, and there is usually no pain. When lymphatic fluid is produced in large amounts, it can cause a loss of nutrients in the body. Some people develop hypoproteinemia. Enhanced nutrition is needed. In addition, when lymphatic fluid is absorbed, some patients develop fever, and individuals have a high temperature, up to 39 degrees Celsius. This is when it needs to be differentiated from lymphatic abscess, which is usually considered to be lymphatic cyst infection or lymphatic abscess when there is significant pressure pain at the cyst, increased blood count and CRP. There are also a few people who have lymphatic cysts that are not large, but due to truncated lymphatic return, lymphatic fluid accumulates in the legs bilaterally, causing swelling in the legs. What about the treatment of lymphatic cysts? If there is no infection, the main treatment is medication, using indomethacin suppository anal once a day to promote the occlusion of small lymphatic vessels, and also has an antipyretic effect, and usually does not require fluid extraction unless it is really uncomfortable. If there is an infection, then puncture and aspiration is required, and antibiotics are administered, while indomethacin suppositories are continued. Usually after treatment, they all shrink significantly or even disappear 3 months after surgery. As for the patients with swollen legs, there is no special solution, they can use tension stockings during the day and elevate the swollen legs after taking off the stockings at night. If not treated in this way, the swelling of the lower limbs will not recover to a certain extent.