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Focal Nodular Hyperplasia : Microscopic

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The fibrous stroma at the periphery of the nodules in focal nodular hyperplasia (FNH) characteristically contains a variable number of bile ductular structures. Note the absence of well-formed portal structures. CK7 and CK19 immunostaining can be used to highlight these bile ductular proliferations, which distinguish FNH from hepatocellular adenoma.

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