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Representative histopathology of BilIN-1, 2, and 3 by frozen section diagnosis. A: Normal mucosa; B: Borderline (BilIN-1); (C) Borderline (BilIN-2); and D: Positive (BilIN-3) (hematoxylin and eosin, 20 ×). BilIN: Biliary intraepithelial neoplasia.
