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Histological appearance (a) and results of immunohistochemical staining (b) of focal nodular hyperplasia. (a) The lesion is characterized by thick fibrous septa with a central scar, thick-walled abnormal blood vessels, and ductular reaction. (b) Immunohistochemistry for GS shows a map-like staining pattern. (Original magnification: ×100 for (a,b)).
