Peroral cholangioscopy for non-invasive papillary cholangiocarcinoma with extensive superficial ductal spread

Figure 3 Peroral cholangioscopy of the interior of the right hepatic duct. A: Fine granular mucosal lesions, brownish in color, are scattered, suggesting the presence of papillary in situ carcinoma. The flat mucosae between the fine granular lesions, which appear normal on cholangioscopy, corresponded to non-papillary in situ carcinoma histologically. The lower part of this figure is fogged owing to halation. B: Schematic representation. The dotted areas indicate the fine granular lesions.