<p>(A) US image in transverse plane shows negative triangular cord sign (arrow). (B) US image in oblique subcostal plane shows atretic gallbladder measuring 0.8 cm (asterisk) and enlarged hepatic artery measuring 1.5 mm (arrow). US confidence level using a five-point scale is 3 (equivocal biliary atresia) by both observers. (C) 3D MRCP image shows no visible extrahepatic biliary tree and small gallbladder (asterisk). Biliary atresia was diagnosed with certainty by both observers after additional review of MRCP images. (D) Surgical cholangiography shows small gallbladder (asterisk) and a patent but extremely hypoplastic common bile duct (arrowheads), suggesting type 2 biliary atresia.</p
