Focal nodular hyperplasia


Focal nodular hyperplasia (FNH) is a benign 'tumor-like' mass of the liver. It has characteristic imaging features on contrasted-enhanced cross-sectional imaging.

FNH is most frequently identified in young to middle-aged adults, with a strong female predilection.

On CT and MRI the imaging features are classical, which are:

  1. Intense early arterial phase enhancement, with the exception of the central fibrotic scar.
  2. Isointense to liver on portal venous phase.
  3. On the delay phase, the central scar enhances in most cases, as contrast is retained.

This lesion can be left well alone with no need for percutaneous biopsy.