Biliary atresia

A 6-week-old infant boy, born in the United States, comes to the clinic because of slow growth, weight gain, foul-smelling stools, and dark urine. His symptoms began four weeks ago, and have continued to worsen. Physical examination shows an enlarged spleen and jaundiced skin. Serum AST, ALT, and total bilirubin concentrations are elevated. Abdominal ultrasound shows a triangular cord sign. A HIDA scan shows obstruction of flow from the liver into the gallbladder and small intestine. Which of the following is the most appropriate next step in management?

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