Table 1.

Classification of right hepatic duct variations according to Huang et al. and Karakas et al.

Huang type	Description	Karakas type
A1	Right posterior sectoral duct (RPSD) drains into the right anterior sectoral duct (RASD)	K1 – distance of RPSD and RASD junction >1 cm from the confluence of RHD and LHD
		K2a – distance of RPSD and RASD junction ≤1 cm from the confluence of RHD and LHD
A2	Trifurcation pattern of insertion of RPSD, RASD and left hepatic duct (LHD)	K2b
A3	RPSD drains into LHD	K3a – junction of RPSD and LHD ≤1 cm from the confluence
		K3b – junction of RPSD and LHD >1 cm from confluence
A4	RPSD drains into the common hepatic duct (CHD)	K4
A5	RPSD drains into the cystic duct	K5