Epidemiology
• Metastases are the most common cause of malignant masses seen in the liver. GIS (in the foreground) cancers metastasize to the liver most frequently.• The most common primary benign tumor of the liver is hemangioma.
• The most common primary malignant tumor of the liver is hepatocellular carcinoma.
Benign Tumors
Hemanogioma
• They are usually asymptomatic.• Hemangiomas are most common in the liver in adults.
• The most common type is cavernous hemangioma and is located under Glisson's capsule.
• In contrast-enhanced CT/MR, it is hypodense in the middle and shows enhancement in the periphery.
Hepatic Adenoma
• It is frequently seen in women and is closely related to the use of oral contraceptives.Contrast-enhanced CT/MR shows smooth and homogeneous contrast enhancement.
• It may cause bleeding as a result of intraabdominal rupture.
• It has a malignant potential, albeit low.
Focal Nodular Hyperplasia
The relationship between focal nodular hyperplasia (FNH) and oral contraceptive (OCS) is controversial; however, OCS can cause the growth of existing FNH.• Enhanced central scar is the typical finding on contrast-enhanced CT/MR.