Focal nodular hyperplasia: imaging findings

Focal nodular hyperplasia is an uncommon benign hepatic tumor that continue s to pose diagnostic dilemmas. Imaging techniques are of great value in dia gnosis of this tumor. In this article we present the US, CT, MR imaging, sc intigraphy, and angiography findings. The demonstration of a central vascul ar scar is very helpful. Although the radiologic features may be diagnostic , many atypical cases must be differentiated from other benign or malignant hepatic tumors. In these cases excisional biopsy and histopathologic exami nation are necessary to determine a definite diagnosis.