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Fig. 1. Digital single-operator cholangioscopy images with benign narrowing of the common bile duct in primary sclerosing cholangitis (A) and visual features concerning for malignancy including dilated and tortuous “tumor vessels” (B), papillary or villous projections (C), friability, ulceration, and fibrosis (D). Biopsies of Fig. B–D all confirmed cholangiocarcinoma by pathology.
Gastrointestinal Intervention 2017;6:2~8 https://doi.org/10.18528/gii160035
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