Focal nodular hyperplasia

Focal nodular hyperplasia (FNH) is a benign liver lesion characterized by a hyperplastic nodule of hepatocytes, often containing a central scar, typically arising in young women. Clinically, it is significant as it can mimic malignant liver tumours on imaging, leading to unnecessary interventions; thus, accurate diagnosis is crucial. FNH is commonly associated with the use of oral contraceptives, which may influence its development.