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Figure 10b.   Choledochal cyst with biliary atresia in a newborn who presented with increasing jaundice and in whom a cystic abdominal mass had been noted at prenatal US. (a) Sagittal sonogram of the right upper quadrant shows a large cystic mass in the porta hepatis. The mass, a choledochal cyst (CC), tapers cranially. The liver echotexture is coarse, and none of the intrahepatic bile ducts or a normal common bile duct are visualized. A = aorta, HV = hepatic vein, pv = portal vein. (b) Color Doppler image shows biliary vessels surrounding the avascular choledochal cyst (CC). (c) Intraoperative cholangiogram shows aqueous contrast material filling the gallbladder (GB) and choledochal cyst (CC) with no filling of the intrahepatic bile ducts.