A 10-month-old male infant presented with massive hepatomegaly. There was no history of jaundice, fever, weight loss, blood in stool, or acholic stool. He was born at full term without any complications, and the newborn screening test results were normal. The maternal perinatal history was unremarkable for infections, previous blood transfusion, or intravenous drug use. Family history was negative for jaundice, early infantile death, neurodegenerative disorder, or ...