Prenatal ultrasound diagnosis of fetal choledochal cysts

Objective To assess the application of ultrasonography in prenatal diagnosis of fetal choledochal cysts. Methods The clinical data of 25 fetuses, who were diagnosed as fetal choledocho cysts using ultrasonography and followed up, were retrospectively analyzed. Results Among 25 cases, 24 cases were confirmed as congenital choledochal cysts after normal delivery or abortion, and 1 case of liver cyst was misdiagnosed. The 24 cases′ prenatal ultrasound showed liver cystic space occupying wihich was connected to intrahepatic bile duct or gallbladder.The cysts wall was thin, and the colour Doppler flow imaging CDFI showed that blood vessels circled around the cyst.In 24 fetuses with prenatal choledochal cysts, 21 were full-term birth, 3 were aborted including 1 case with other congenital abnormalities. The size of choledochal cysts was not changed in 5 cases, and was enlarged with the gestational ages in remaining 16 cases fetuses. The choledochal cysts did not affect fetal growth and development. The newborn infants with congenital choledochal cysts were treated surgically within 8 months after birth and all recovered well. Conclusion Fetal choledochal cysts have typical sonographic manifestations.Ultrasonography can be used for prenatal diagnosis of congenital choledochal cysts, which can be successfully treated by surgery early after birth. Key words: Prenatal ultrasonography; Fetus; Choledochal cyst; Intrauterine growth; Prognosis