Intraoperative frozen section diagnosis of bile duct margin for extrahepatic cholangiocarcinoma

Table 6 Details of diagnostic discordance between frozen section diagnosis and permanent section diagnosis

	Epithelial layer (pCCA:dCCA)	Subepithelial layer (pCCA:dCCA)
From negative to borderline	4 (2:2)	0 (0:0)
From negative to positive	1 (0:1)	1 (1:0)
From borderline to negative	20 (13:7)	0 (0:0)
From borderline to positive	2 (2:0)	1 (0:1)
From positive to borderline	4 (4:0)	0 (0:0)
Total	31 (21:10)	2 (1:1)

pCCA: Perihilar cholangiocarcinoma; dCCA: Distal cholangiocarcinoma.