Jellyfish head sign

Sea snake head sign ("Jellyfish head" sign)-cerebral venous malformation (brain developmental vein abnormality), abnormally enlarged medullary veins drain into 1 or 2 large drainage veins, forming a "sea snake head" sign, without accompanying blood supply Artery and direct arteriovenous short circuit. When portal hypertension occurs, the umbilical vein reopens and connects with the para-umbilical vein and abdominal wall veins. A tortuous vein is formed in the abdominal wall around the umbilicus. The blood flow direction is above the umbilicus and upward, and below the umbilicus. This direction of blood flow can be distinguished from the collateral circulation caused by superior or inferior vena cava obstruction. Significant abdominal varicose veins can be a jellyfish-like sign called jellyfish head. It is a clinical manifestation of portal hypertension. Portal hypertension is a group of symptoms caused by persistently elevated portal pressure. The vast majority of patients are caused by liver cirrhosis, and a few patients are secondary to portal vein trunk or hepatic vein obstruction and some unknown reasons.