[A well-differentiated hepatocellular carcinoma within adenomatous hyperplasia]

A 37-year-old male was admitted to hospital for jaundice and ascites. An ultrasonogram revealed a hypoechoic mass located in the right anterior inferior segment. A needle specimen of the liver was taken, and its biopsy led to a histological diagnosis of a hepatocellular carcinoma. The patient subsequently underwent an operation wherein it was found that the resected tumor that was taken was not clearly demarcated from the cirrhotic parenchyma. The histological diagnosis was an adenomatous hyperplasia. In a portion of this adenomatous hyperplasia, highly consistent hepatic cells and pseudogland formations were seen, confirming the diagnosis of a well-differentiated hepatocellular carcinoma within an adenomatous hyperplasia.