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Table 2 Classification of congenital extrahepatic portosystemic shunts—Abernethy malformations [10, 11]

From: All about portal vein: a pictorial display to anatomy, variants and physiopathology

Type Description
I Complete absence of intrahepatic portal venous flow
Ia
IIb
Congenital absence of the PV with separate drainage of the SMV and splenic vein into systemic veins
SMV and splenic vein join to form a short extrahepatic PV which drains into a systemic vein
II Partial shunt with preserved hepatic portal venous flow
IIa
IIb
IIc
Arising from left or right PV including patent ductus venosus (Fig. 7)
Arising from main PV
Arising from the other PV tributaries