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Polyp problem

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Question

An 86-year-old man is evaluated for epigastric pain. He has a history of choledocholithiasis requiring ERCPs. MRCP reveals filling defects at the level of the common hepatic duct. On ERCP, surprisingly, the polypoid material (Figure) is extracted from the duct. Direct peroral cholangioscopy is performed with resection of the biliary lesion. Treatment of the base is then performed with radiofrequency ablation. Which of the following is true?

Direct cholangioscopy with a pediatric gastroscope is advantageous over through-the-scope cholangioscopy because of the larger working channel and the number of available accessories. Post-radiofrequency ablation stenting is unnecessary to reduce the risk of post-ablation strictures. The bile duct can be easily accessed using the pediatric gastroscope through standard upper endoscopy technique. Intraductal tubulopapillary neoplasms are the common precursor to cholangiocarcinoma.
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