The appearances of most common liver neoplasms at computed tomography
(CT) and magnetic resonance (MR) imaging have been established, Howeve
r, there are considerable overlaps in the appearances of various patho
logic entities, Certain hepatic lesions, such as hepatic hemangioma, a
denoma, focal nodular hyperplasia, intrahepatic cholangiocarcinoma, me
tastases, hepatocellular carcinoma, regenerative nodules, adenomatous
hyperplastic nodules, abscess, and hepatocellular carcinoma treated wi
th transcatheter arterial chemoembolization, can have unusual characte
ristics at CT and MR imaging that may lead to misinterpretation, Dynam
ic helical CT and double-phase multisection dynamic MR imaging techniq
ues may be helpful in differentiating between these entities because h
emodynamics of the lesion can be evaluated by obtaining both arterial-
phase and delayed-phase images, It is important for radiologists to be
aware of these uncommon appearances of liver neoplasms. Familiarity w
ith these varied CT and MR imaging features will permit a more accurat
e diagnosis and aid in avoidance of a false diagnosis.