title: Cystic tumor of the liver without ovarian-like stroma or bile duct communication: two case reports and a review of the literature.
abstract: We report two cases of cystic neoplasm of the liver with mucinous epithelium in which both ovarian-like stroma and bile duct communication were absent. The first case was a 41-year-old woman. She underwent right trisegmentectomy due to a multilocular cystic lesion, 15 cm in diameter, with papillary nodular components in the medial segment and right lobe. Histologically, arborizing papillae were seen in the papillary lesion. The constituent neoplastic cells had sufficient cytoarchitectural atypia to be classified as high-grade dysplasia. The second case was a 60-year-old woman. She underwent left lobectomy due to a unilocular cystic lesion, 17 cm in diameter, in the left lobe. Histologically, the cyst wall was lined by low columnar epithelia with slight cellular atypia. In both cases, neither ovarian-like stroma nor bile duct communications were found throughout the resected specimen. According to the most recent World Health Organization (WHO) classification in 2010, cystic tumors of the liver with mucinous epithelium are classified as mucinous cystic neoplasms when ovarian-like stromata are found, and as intraductal papillary neoplasm of bile duct when bile duct communication exists. Therefore, we diagnosed the cystic tumors as 'biliary cystadenoma' according to the past WHO classification scheme from 2000. We believe that the combined absence of both ovarian-like stroma and bile duct communication is possible in mucinous cystic tumors of the liver. Herein, we have described the clinicopathologic features of the two cases and reviewed past cases in the literature.
authors.forename: Norihiro
authors.initials: N
authors.lastname: Kishida
authors.affiliation: Department of Surgery, Keio University, School of Medicine, 35 Shinanomachi, Shinjuku-ku, Tokyo 160-8582, Japan. masa02114@yahoo.co.jp.
authors.forename: Masahiro
authors.initials: M
authors.lastname: Shinoda
authors.forename: Yohei
authors.initials: Y
authors.lastname: Masugi
authors.forename: Osamu
authors.initials: O
authors.lastname: Itano
authors.forename: Yoko
authors.initials: Y
authors.lastname: Fujii-Nishimura
authors.forename: Akihisa
authors.initials: A
authors.lastname: Ueno
authors.forename: Minoru
authors.initials: M
authors.lastname: Kitago
authors.forename: Taizo
authors.initials: T
authors.lastname: Hibi
authors.forename: Yuta
authors.initials: Y
authors.lastname: Abe
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Yagi
authors.forename: Akihiro
authors.initials: A
authors.lastname: Tanimoto
authors.forename: Minoru
authors.initials: M
authors.lastname: Tanabe
authors.forename: Michiie
authors.initials: M
authors.lastname: Sakamaoto
authors.forename: Yuko
authors.initials: Y
authors.lastname: Kitagawa
mesh_terms: D000231:Adenocarcinoma, Papillary / Q000473:pathology* / Q000601:surgery; D000328:Adult; D001652:Bile Ducts / Q000473:pathology*; D003536:Cystadenocarcinoma / Q000473:pathology* / Q000601:surgery; D005260:Female; D006801:Humans; D008113:Liver Neoplasms / Q000473:pathology* / Q000601:surgery; D008875:Middle Aged; D010053:Ovary / Q000473:pathology*; D011379:Prognosis; D017154:Stromal Cells / Q000473:pathology*