Intraoperative frozen section diagnosis of bile duct margin for extrahepatic cholangiocarcinoma

Figure 4 Local recurrence-free survival analysis according to the permanent section diagnosis status. The Kaplan-Meier curves of patients with eCCA according to the status of the bile duct margin evaluated by PSD in total layer (A) and epithelial layer (B). Patients with borderline or positive subepithelial layer were excluded from the analysis in the epithelial layer. Black line: negative; Red line: borderline; Green line: positive; eCCA: Extrahepatic cholangiocarcinoma; PSD: Permanent section diagnosis.