Benign tumors of the liver are relatively common, but usually have no clinical presentation. Most cases are detected incidentally by ultrasound or other scans, while others are detected because of hepatomegaly, right upper abdominal discomfort or intra-abdominal bleeding. Liver function tests are often normal or only slightly variable in these patients. Hepatocellular adenoma is the most important benign tumor of the liver and is mainly seen in women of childbearing age. The incidence has increased with the widespread use of oral contraceptives, which may therefore play an important role in their development. Most adenomas are asymptomatic and are found mostly during physical examinations. Although adenomas of the liver are not precancerous, several cases of malignant transformation have been reported. Oral contraceptive-associated adenomas usually resolve spontaneously after discontinuation of the pill. The imaging diagnosis of hepatic adenoma is somewhat similar to that of hepatocellular carcinoma, but most patients do not have a history of hepatitis and they tend to occur in young women. Localized nodular hyperplasia is a similar tumor-like confined lesion with a histologic presentation similar to that of large nodular cirrhosis. Oral contraceptive pills can enlarge localized nodular hyperplasia, but are not the cause of this disease. No carcinogenesis has been reported in China or abroad. The imaging is sometimes cool like hepatocellular carcinoma, but most nodules contain occluded blood vessels in the center and show delayed phase enhancement on imaging. In addition, other non-neoplastic nodular lesions are present. The incidence of asymptomatic small hemangiomas in adults is approximately 1-5%, with characteristic changes seen on ultrasound, CT or MRI, and are usually single. In infants, large hemangiomas can sometimes be detected because of associated consumptive coagulopathy or hemodynamic disturbances. In addition, biliary adenomas and some rather rare mesenchymal tumors may be seen.