Cystic micropapillary neoplasm of peribiliary glands with concomitant perihilar cholangiocarcinoma

Figure 2 Pathological findings. A: Low-power histologic image of the same region showing a multilocular cystic lesion (*) and the common hepatic duct involving the carcinoma; B: Another level of a cystic lesion shows a multilocular cystic lesion with some areas exhibiting a micropapillary pattern (arrows), HE; C: The multilocular parts show fine septae lined by columnar epithelium, HE; D: The lining epithelium is columnar with clear cytoplasm, and a pyloric glandular pattern is visible underneath, HE; E: Micropapillary patterns, HE; F: The border of the cystic lesion is rimmed by non-neoplastic peribiliary glands (arrow), HE. HE: Hematoxylin and eosin.