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Accessory bile duct
An accessory bile duct is a conduit that transports bile and is considered to be supernumerary or auxiliary to the biliary tree.
It may be described by its location relative to the gallbladder as supravesicular (superior to the gallbladder body) or subvesicular (inferior to the gallbladder body).
==Duct of Luschka==
In the surgical literature, the term duct of Luschka is used to refer to an accessory bile duct. They are small ducts that distinctly enter the gallbladder bed, or small tributaries of minor intrahepatic radicals of the right hepatic ductal system.〔http://www.uptodate.com/contents/complications-of-laparoscopic-cholecystectomy?detectedLanguage=en&source=search_result&search=luschka&selectedTitle=1~12&provider=noProvider〕 They can drain directly from the liver into the body of the gallbladder.〔http://accessmedicine.com/content.aspx?aID=5026669〕 They may not always drain bile and sometimes can have blind distal ends.〔 One study showed them originating from the liver parenchyma of the right anterior inferior dorsal subsegment or from the connective tissue of the gallballder bed. The study showed the distal connections ending at the hepatic right anterior inferior dorsal branch, hepatic right anterior branch, right hepatic duct, or common hepatic duct.
The term ''duct of Luschka'' is ambiguous, as it may refer to supravesicular〔〔 or subvesicular ducts.〔〔 Supravesicular ducts are typically in the gallbladder bed. A 2012 review suggested that the term ''duct of Luschka'' should be abandoned because of this ambiguity and replaced by the more specific term ''subvesical bile duct''. As well, the exact origin and drainage locations of the relevant duct(s) varied greatly between patients.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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