A 25-year-old woman has a 4.5 cm segment IV liver lesion discovered incidentally on a renal ultrasound scan after a urinary tract infection. She is fit and well, without symptoms. She is referred to a hepatobiliary unit and investigated with a contrast enhanced MRI scan. She is told she has no underlying chronic liver disease and the lesion is called "focal nodular hyperplasia".

Which of the following statements is true?