Immunohistologically, CTNNB1 mutations in exon 3 non-S45, or exon 3 S45, or exon 7/8 in b-catenin-mutated HCA (b-HCA) and b-catenin-mutated inflammatory type HCA (b-IHCA) show characteristic GS patterns [1]. The gene discussed is CTNNB1; the disease is hepatocellular adenoma.