Approximately 60% to 70% originate in the hepatic duct confluence. Although some studies mistakenly consider them to be intrahepatic, most recently they have been categorized based on their topographic place of origin 2.
Aproximadamente el 60-70% se originan en la confluencia, y aunque erróneamente se han considerado en algunos estudios como intrahepáticos, hoy se categorizan diferente basados en su sitio topográfico de origen 2.