Hepatocellular adenoma (HCA) is a heterogeneous entity, from both the histomorphological and molecular aspects, and the resultant subclassification has brought a strong translational impact for both pathologists and clinicians. In this review, we provide an overview of the recent updates on HCA from the pathologists’ perspective and discuss several practical issues and pitfalls that may be useful for diagnostic practice.
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This report presents a case of an atypical nodule arising in a hepatocellular adenoma(HCA) in a non-cirrhotic liver of a 42-year-old man. The patient had been relatively healthy until he developed right upper abdominal pain. Abdominal sonography and computerized tomogram revealed a 7.5x7cm sized mass in the right inferior segment of liver. The mass revealed the histologic features of HCA. At near center of the HCA, was found a I cm sized discrete nodule, a nodule within a nodule. The nodule revealed higher cellularity than the HCA and was composed of monotonous hepatocytes with an increased nuclear-cytoplasmic ratio, resembling atypical adenomatous hyperplasia. Interestingly, the atypical nodule showed a focal pseudoacinar arrangement of tumor cells. The histologic features of the atypical nodule arising in HCA may the morphological sequence of transformation from HCA to hepatocellular carcinoma