Benign neoplasms of the liver

Abstract

Benign liver lesions are a vast variety of solid or cystic entities mostly found in the absence of underlying chronic liver disease. Cystic lesions will be considered in another chapter. Solid lesions are usually classified by pathologists based on the cell of origin, into epithelial or mesenchymal formations. Furthermore, some correspond to regenerative lesions when others are truly neoplastic. Epithelial lesions include hepatocellular (focal nodular hyperplasia - FNH and hepatocellular adenomas - HCAs) and cholangiocellular tumors (bile duct adenoma and biliary hamartoma). Mesenchymal tumors include hemangiomas, angiolipomas, lipomas, and leiomyomas.