Focal nodular hyperplasia is a rare benign tumor that appears in the liver. It is composed of the normal liver cells surrounded by areas of fibrosis. Focal nodular hyperplasia is often discovered during a liver imaging exam performed for another reason, because this tumor is not generally responsible for any symptoms and no biological disturbance. The progression is usually stable, the tumor does not grow, and is painless, hence the lack of treatment. In rare cases, surgical removal is considered.