Inflammatory hepatocellular adenoma (HCA). (a) Cut surface shows whitish nodular lesion sized 3 cm in diameter (arrowheads). There was no capsule and the border between nodule and background liver is unclear. Congestion or bleeding is observed inside the nodule (asterisk). Bar = 1 cm. (b) Border of HCA and background liver. Ductular reaction is focally seen in HCA (asterisk). HE, ×100. (c) Ductular reaction with lymphoid cells infiltration in HCA. HE, ×200. (d) Strong expression of serum amyloid A component (SAA) in HCA in contrast to the background liver. Immunostaining for SAA and hematoxylin. ×100. (e) bar = 1 cm.
