The Triangular Sign, a Useful Diagnostic Marker for Biliary Atresia: A Case Series of Three Irish Infants

Smith A, Shankar A, Collins A, Tarrant A,  Boyle MA

Smith et al describe the triangular cord (TC) sign in cases of biliary atresia.  It is a triangular shaped echogenic density at the portal vein bifurcation.
(P776)