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Focal nodular hyperplasia
It is a benign lesion, presenting as a solitary nodule or, less commonly, as several nodules. Most patients are women in their third or fourth decade. The lesions usually have a central scar and are composed of nodules of hepatocytes, which are separated from one another by radiating fibrous septae containing bile ductules.
Cytologic diagnostic features
- Hepatocytes without significant atypia
- Bile ductular cells
- Hepatic adenoma
- Regenerating nodules in cirrhosis
- Normal liver
These lesions are not cytologically distinguishable.