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This video shows Cystic Hygroma with a pregnancy of about 15 weeks. Cystic hygroma is the most frequent fetal neck mass in first-trimester ultrasound. A routine ultrasound during pregnancy can discover a cystic hygroma. At about 10 weeks of pregnancy, ultrasounds show some babies to have more fluid than expected at the back of the neck. This fluid appears as a large, clear space, referred to as "increased nuchal fold," "nuchal thickness," or "nuchal lucency." A routine ultrasound during pregnancy can discover a cystic hygroma. At about 10 weeks of pregnancy, ultrasounds show some babies to have more fluid than average at the back of the neck. This fluid appears as a large, clear space, referred to as "increased nuchal fold," "nuchal thickness," or "nuchal lucency." A cystic hygroma is a fluid-filled sac that results from a blockage in the lymphatic system. It is most commonly located in the neck or head area but can be located anywhere in the body. It may be discovered in a fetus during a pregnancy ultrasound, or it may be apparent at birth as a soft bulge under the skin. Doctors usually diagnose cystic hygromas when the fetus is still in the womb, often during a routine abdominal ultrasound. Doctors may also detect it during a blood test carried out at 15 to 20 weeks. If the blood test shows high levels of alpha-fetoproteins, it might indicate a possible cystic hygroma. The overall survival rate for fetal cystic hygroma is 10%. Prognosis remains guarded regardless of all other factors until the fetus reaches 26 weeks' gestation, after which time a 67% chance of ultimate survival can be expected. Only 42% of documented survivors were completely normal at follow-up. Cystic hygromas are benign tumors that appear as a fluid-filled sac, often forming on a newborn's neck. The cyst develops because of a lymphatic system blockage, which causes fluid to build up under the skin. These cysts can be life-threatening and could lead to miscarriage or stillbirth. A cystic hygroma is a cyst, or a group of cysts, found mainly in the neck. They are caused by an error in the development of lymph sacs and lymph vessels as the baby develops during pregnancy. By the end of the fifth week of pregnancy, the baby's lymphatic tissues form as lymph sacs. Ultrasound findings of cystic hygroma include thin-walled and serpiginous or multiseptated intradermal fluid collections which are often found in cervical regions. It consists of fluid-filled posterior or posterolateral cavities in the neck. The overall prognosis is poor as there is a high association between chromosomal and structural anomalies and progression to hydrops and fetal demise. CH is an abnormality of the vascular lymphatic system, characterized by the development of distended fluid-filled spaces, typically affecting the fetal neck (80% of cases). Based on the presence of septations, it can be classified into septated or nonseptated CH. CH is frequently associated with other malformations, particularly congenital heart defects (CHD) and chromosomal abnormalities (75% of cases). Turner syndrome is the most common associated chromosomal abnormality, affecting approximately 60% of cases. A cystic hygroma is usually treatable if it's present at birth or develops later. The first step of treatment is surgery. The entire growth must be removed to prevent it from coming back. In some cases, however, your doctor may not want to remove large cystic hygromas. A cystic hygroma is usually treatable if it's present at birth or develops later. The first step of treatment is surgery. The entire growth must be removed to prevent it from coming back. In some cases, however, your doctor may not want to remove large cystic hygromas.