title: Ciliated hepatic foregut cyst mimicking neoplasm.
abstract: We describe a ciliated hepatic foregut cyst that was clinically considered neoplastic because it was large, bilocular, and associated with a high serological level of carbohydrate antigen 19-9 (CA 19-9). Histologically, the wall of the cyst showed characteristic pseudopapillae lined by ciliated stratified columnar epithelium with interspersed goblet cells and underlying smooth muscle. The epithelium was strongly immunoreactive for CA 19-9. We therefore conclude that large size, multilocularity, and elevated CA 19-9 do not exclude ciliated hepatic foregut cysts from diagnostic consideration.
authors.affiliation: Department of Pathology, Northwestern Memorial Hospital, Chicago, Illinois 60611, USA.
authors.forename: M L
authors.initials: ML
authors.lastname: Wu
authors.forename: M M
authors.initials: MM
authors.lastname: Abecassis
authors.forename: M S
authors.initials: MS
authors.lastname: Rao
mesh_terms: D000328:Adult; D018395:CA-19-9 Antigen / Q000032:analysis; D003560:Cysts / Q000175:diagnosis* / Q000473:pathology; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D008107:Liver Diseases / Q000175:diagnosis* / Q000473:pathology; D008113:Liver Neoplasms / Q000175:diagnosis*
chemical_list: D018395:CA-19-9 Antigen