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Adenoma-like (a, H&E, × 20) and hepatocellular carcinoma portion (b, H&E, × 20) in a tumor in a 33-year-old male. There was β-catenin activation evidenced by diffuse glutamine synthetase staining in both adenoma-like (c, × 20) and hepatocellular carcinoma portions (d, × 20). The glutamine synthetase staining was stronger in the hepatocellular carcinoma portion. There were no chromosomal gains.
