Focal nodular hyperplasia (FNH) is developmental in origin, consisting of a nonneoplastic hyperplastic response of hepatic parenchyma to the increased blood flow related to a preexisting arterial malformation. FNH is the second most common benign hepatic tumor after hemangioma and often discovered incidentally. The CT and MRI appearances of hepatocellular adenoma are varied, and reflect the quantity of fat, hemorrhage, and necrosis within the tumor. Angiomyolipoma is an uncommon benign mesenchymal tumor composed of smooth muscle, blood vessels, and variable amounts of adipose tissue. Peliosis hepatis occurs most commonly in the liver, but can occasionally occur in other parts of the reticuloendothelial system, including the spleen or bone marrow. Inflammatory myofibroblastic tumors (IMTs) are characterized by proliferation of nonneoplastic myofibroblastic spindle cells. IMTs are rare lesions of uncertain etiology that may arise in many organs in the body including the liver.