title: Accessory liver lobe with mesothelial inclusion cysts in an omphalocele: a new malformative association.
abstract: Mesothelial inclusion cysts represent benign lesions that have been reported in a wide variety of locations. Peritoneal cysts are observed and visceral involvement has been described, notably of intraperitoneal organs such as the spleen and the testis. We report the cases of 2 neonates who underwent surgical management of an omphalocele. The hernial sac contained an accessory liver lobe, displaying in both cases multilocular mesothelial inclusion cysts. The hobnail cells lining the cysts exhibited calretinin and cytokeratin immunohistochemical reactivity, as well as focal D2-40 reactivity. One of the cases occurred in the setting of a Beckwith-Wiedemann syndrome (MIM 130650), an overgrowth disorder notably associated with omphalocele and hepatic anomalies and tumors. However, no hepatic mesothelial cyst has been described in this syndrome. In the 2nd case the omphalocele and the hepatic cysts were the sole lesions observed in the neonate. To the best of our knowledge, these 2 cases represent the first description of such an association.
authors.affiliation: Department of Pathology, CHU Sainte-Justine, Montréal, QC, H3T 1C5, Canada.
authors.forename: Anne-Laure
authors.initials: AL
authors.lastname: Rougemont
authors.forename: Hervé
authors.initials: H
authors.lastname: Sartelet
authors.forename: Luc L
authors.initials: LL
authors.lastname: Oligny
authors.forename: Arie
authors.initials: A
authors.lastname: Bensoussan
authors.forename: Salam
authors.initials: S
authors.lastname: Yazbeck
authors.forename: Jean-Christophe
authors.initials: JC
authors.lastname: Fournet
mesh_terms: D000911:Antibodies, Monoclonal / Q000378:metabolism; D058846:Antibodies, Monoclonal, Murine-Derived; D001506:Beckwith-Wiedemann Syndrome / Q000175:diagnosis / Q000473:pathology; D064032:Calbindin 2; D003560:Cysts / Q000378:metabolism / Q000473:pathology*; D004848:Epithelium / Q000378:metabolism / Q000473:pathology; D006554:Hernia, Umbilical / Q000473:pathology* / Q000601:surgery*; D006651:Histocytochemistry; D006801:Humans; D007150:Immunohistochemistry; D007231:Infant, Newborn; D007633:Keratins / Q000378:metabolism; D008107:Liver Diseases / Q000473:pathology*; D008297:Male; D064030:S100 Calcium Binding Protein G / Q000378:metabolism; D016896:Treatment Outcome
chemical_list: D000911:Antibodies, Monoclonal; D058846:Antibodies, Monoclonal, Murine-Derived; C576764:CALB2 protein, human; D064032:Calbindin 2; D064030:S100 Calcium Binding Protein G; C500987:monoclonal antibody D2-40; D007633:Keratins