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Focal Nodular Hyperplasia

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Focal nodular hyperplasia (FNH) is usually solitary. About 20%-30% of cases have multiple lesions and such patients may have concomitant cavernous hemangiomas of the liver, berry aneurysms, and brain tumors. FNH is typically <5 cm but there is great size variation. Most FNH >1 cm have central fibrous scars, which consist of fibrovascular tissue (not dense collagen).

Unlike conventional FNH, the rare telangiectatic variant lacks a central fibrous zone and may resemble vascular lesions (such as hemangioma) or peliosis hepatis.This lesion (telangiectatic variant) is now reclassified as an inflammatory hepatocellular adenoma. This case has multiple stellate scars in the center of the lesion.

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