(A) Selective occlusion balloon angiography in the superior mesenteric vein. (B) The intrahepatic portal vein branches are relatively well-developed. (C and D) Transcatheter occlusion of the congenital portosystemic shunt using a 20-mm AMPLATZER Vascular Plug II (AVP II; AGA Medical Corporation, Plymouth, MN, USA). CPSS, congenital portosystemic shunt.