HNF1A and hepatocellular adenoma: In this paper, we review the clinical/epidemiological context of HCA, based on our experience (personal cases and consult cases); all these cases being classified according to the pathomolecular classification into four groups, as previously published are HNF1α-inactivated HCA (H-HCA), inflammatory HCA (IHCA), β-catenin activated HCA (b-HCA and b-IHCA) and unclassified HCA (UHCA).