A 32-year-old woman on oral contraceptive pills for 8 years presents with an incidentally discovered liver lesion on abdominal ultrasound. She is asymptomatic with normal liver function tests and negative viral hepatitis panel. Triple-phase contrast-enhanced CT shows a 5.2 cm well-circumscribed lesion in segment V with intense homogeneous arterial phase enhancement and a central stellate hypodense area that shows delayed enhancement on the delayed phase. The remaining liver parenchyma is normal. The structure marked **B** in the diagram represents the imaging findings described above. Which of the following best characterizes the pathophysiology and clinical significance of this lesion?
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