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Hypothetical adjuvant radiotherapy fields in intrahepatic cholangiocarcinoma. Potential clinical target volume (CTV) is defined as remnant liver within 1 cm from resection margin, perihilar, periduodenal, peripancreatic, celiac, caval, and periaortic (from 1 cm above of celiac axis to left renal artery bifurcation) lymph node area
