Journal of Pathology and Translational Medicine

Case Study

Hepatocellular Carcinoma Arising in a Huge Hepatocellular Adenoma with Bone Marrow Metaplasia: Hyo Jeong Kang, Hui Jeong Jeong, So-Woon Kim, Eunsil Yu, Young-Joo Lee, So Yeon Kim, Jihun Kim; J Pathol Transl Med. 2018;52(4):226-231. Published online December 27, 2017; DOI: https://doi.org/10.4132/jptm.2017.11.12

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Hepatocellular adenoma (HCA) is the most common type of benign liver tumor, and its major complication is malignant transformation to hepatocellular carcinoma (HCC). Here, we report a case of HCC arising in HCA with bone marrow metaplasia in a 24-year-old Korean woman who presented with abdominal discomfort. A huge liver mass was found on abdominal ultrasonography. She underwent surgical hepatic resection, and the resected specimen was entirely involved by a 20-cm-sized tumor. Histological review revealed a well differentiated HCC arising from inflammatory HCA with β-catenin nuclear positivity and bone marrow metaplasia that contained hematopoietic cells. This case was unique because malignant transformation, inflammatory type HCA, β-catenin nuclear staining, and bone marrow metaplasia were simultaneously observed. Additionally, it should be noted that a large HCA with β-catenin activation can undergo malignant transformation and should be surgically resected in a timely manner.

Citations

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Original Article

Clinicopathological Analysis of Hepatocellular Adenoma According to New Bordeaux Classification: Report of Eight Korean Cases: Hyunchul Kim, Ja-June Jang, Dong-Sik Kim, Beom Woo Yeom, Nam Hee Won; Korean J Pathol. 2013;47(5):411-417. Published online October 25, 2013; DOI: https://doi.org/10.4132/KoreanJPathol.2013.47.5.411

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Abstract PDF

Background

Hepatocellular adenoma (HCA) is a rare benign tumor of the liver. A subtype classification of HCA (hepatocyte nuclear factor 1α [HNF1α]-mutated, β-catenin-mutated HCA, inflammatory HCA, and unclassified HCA) has recently been established based on a single institutional review of a HCA series by the Bordeaux group.

Methods

We used histologic and immunohistochemical parameters to classify and evaluate eight cases from our institution. We evaluated the new classification method and analyzed correlations between our results and those of other reports.

Results

Seven of our eight cases showed histologic and immunohistochemical results consistent with previous reports. However, one case showed overlapping histologic features, as previously described by the Bordeaux group. Four cases showed glutamine synthetase immunohistochemical staining inconsistent with their classification, indicating that glutamine synthetase staining may not be diagnostic for β-catenin-mutated HCA. HNF1α-mutated HCA may be indicated by the absence of liver fatty acid binding protein expression. Detection of amyloid A may indicate inflammatory HCA. HCA with no mutation in the HNF1α or β-catenin genes and no inflammatory protein expression is categorized as unclassified HCA.

Conclusions

Although the new classification is now generally accepted, validation through follow-up studies is necessary.

Citations

Citations to this article as recorded by

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American Journal of Surgical Pathology.2016; 40(4): 454. CrossRef
Pigmented hepatocellular adenomas have a high risk of atypia and malignancy
Taofic Mounajjed, Saba Yasir, Patrice A Aleff, Michael S Torbenson
Modern Pathology.2015; 28(9): 1265. CrossRef

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