Several types of cancer can form in the liver.
Hepatocellular carcinoma (HCC), the most common type of liver cancer, can begin as a single tumor that grows larger or as many small cancer nodules throughout the liver. Although rare, occurring in less than 1% of HCCs, fibrolamellar is a subtype of the disease that can be seen more often in women under the age of 35.
Bile duct cancer, or intrahepatic cholangiocarcinomas, comprises 10% to 20% of liver cancers. This subtype starts in the cells that line the small bile ducts within the liver.
Angiosarcoma and hemangiosarcoma are rare subtypes of liver cancer that begin in cells lining the blood vessels of the liver.
Hepatoblastoma, while very rare, develops in children younger than 4.