A Large Tortuous Umbilical Cord with Superficial Abdominal Wall Varicose Veins in a Newborn.

Abstract

Term male newborn presented at birth with a varicose umbilical cord and a collateral abdominal circulation.After delivery, the infant’s umbilical cord appeared to be tortuous and twice the normal width; in addition, large centrifugal varicose veins were noted bulging under the adjacent skin and extending to the anterior abdominal wall (Figs 1–3). The infant appeared otherwise well but was transferred to the NICU for monitoring and further evaluation.After a multidisciplinary discussion with neonatology, radiology, and pediatric vascular surgery, the team decided to take an expectant approach. During the first days after birth, the umbilical cord volume and collateral abdominal circulation gradually decreased. The newborn was discharged from the hospital on the 7th day after birth, with a mummified umbilical stump and little evidence of the collateral circulation (Fig 4).The umbilical stump fell off on the 20th day of age. At 1 month of age, the infant had redundant umbilical tissue (Fig 5) and small areas in the upper abdominal quadrants showing the collateral circulation. At 4 months of age, there was no evidence of a collateral abdominal circulation.Caput medusae in a newborn is a rare condition with only a few cases reported in the literature. (1)(2) This Latin term translates into “the head of Medusa” and compares the snakes emanating from the head of the Greek monster Medusa with the vessels of the umbilical cord and surrounding abdominal wall. White et al theorized that the caput medusae resulted from the persistence of the right umbilical vein. (1)During the development of the normal fetal circulation, there are initially 2 paired veins in the embryo: 1) the gut vein and its appendages, known as the omphalomesenteric veins, and 2) the veins from the placenta that form the umbilical veins. In the 4-week embryo, the paired umbilical veins run separately on both sides and drain into the sinus venosus. As the liver increases in size anteriorly, the umbilical veins connect with the omphalomesenteric veins to form large venous lakes in the liver. Some branches of the omphalomesenteric veins anastomose around the gut and the venous liver lakes form the ductus venosus in an opposite location from the entry of the left umbilical vein. Later (at the 7-week embryo stage), several anastomoses of the 2 omphalomesenteric veins occur, leading to all of the gut blood draining to the liver through the portal vein. Part of the omphalomesenteric veins is believed to form the hepatic veins and the hepatic part of the inferior vena cava. As this process continues, the right umbilical vein loses its connections to the superior vena cava and to the liver and is reabsorbed, while the left umbilical vein enlarges to form the mature umbilical vein.Arrest in this final phase of right umbilical vein occlusion is responsible for the existence of an alternative umbilical circulation, maintaining blood flow from the placenta through the superficial abdominal veins and resulting in the caput medusae. This persistence is not associated with other congenital malformations. After delivery, the umbilical cord is clamped, blood flow from the placenta ceases, and the collateral circulation progressively disappears.Other causes should be considered in the differential diagnosis of a newborn with an abdominal collateral circulation, including pathologies that require urgent management. These findings can be observed in an infant with obstruction of the inferior vena cava or if there is obstruction of the hepatic veins (known as Budd-Chiari syndrome). A primary cause of Budd-Chiari syndrome is thrombosis of the hepatic veins and secondary causes are compression or invasion of the hepatic veins and/or inferior vena cava. (3) These other causes can be diagnosed on abdominal ultrasonography with Doppler or computed tomography angiography. Evaluation by cardiology is also essential for exclusion of a cardiac pathology. (3)