Abstract
The Committee on Diagnostic Criteria of the Japanese Study Group on Pancreaticobiliary Maljunction (PBM) proposed a PBM classification that was simple to use in clinical practice in 2015. The Committee’s classification divided PBM into the following four types: (a) stenotic type, (b) non-stenotic type, (c) dilated channel type, and (d) complex type.
The classification of congenital choledochal cysts proposed by Alonso-Lej in 1959 classified cysts into three types. After the recognition of intrahepatic involvement, Todani refined this classification into five types with subtypes in 1977. This classification has been the most widely used. However, this classification did not include the concept of PBM. Type Ia, Ic, and IV-A (intrahepatic involvement) cysts are generally accompanied by PBM. Todani revised his classification to include a concept of PBM in 1997.
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Urushihara, N. (2018). Classification of Pancreaticobiliary Maljunction and Congenital Biliary Dilatation. In: Kamisawa, T., Ando, H. (eds) Pancreaticobiliary Maljunction and Congenital Biliary Dilatation. Springer, Singapore. https://doi.org/10.1007/978-981-10-8654-0_7
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