Stealth Lesion Lab is named after focal nodular hyperplasia (FNH) — a benign hepatic mass with a notoriously elusive imaging appearance. FNH is the second most common benign liver tumor, most often discovered incidentally in young women. Its near-isointense appearance on non-contrast imaging makes it a classic “stealth lesion,” blending seamlessly with the surrounding hepatic parenchyma. Characteristic features — including spoke-wheel vascularity, a central scar, and avid arterial enhancement — are key to confident radiologic diagnosis and help distinguish FNH from hepatocellular adenoma and other mimics.
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