title: Hepatic inflammatory pseudotumor associated with xanthogranulomatous cholangitis mimicking cholangiocarcinoma.
abstract: Inflammatory pseudotumor (IPT) is a rare benign condition often misdiagnosed as malignancy. An 80-year-old man was referred to our clinic for an asymptomatic hepatic mass detected on plain abdominal CT. Abdominal ultrasonography identified the lesion as a poorly defined hypoechoic mass. Although a liver biopsy did not provide any evidence of malignancy, imaging modalities suggested a diagnosis of cholangiocarcinoma. The patient underwent left lobectomy, and the pathological findings were consistent with the features of xanthogranulomatous cholangitis. This case is the first report of hepatic IPT originating from xanthogranulomatous cholangitis without symptoms and illustrates the importance of obtaining a preoperative diagnosis in order to avoid a misdiagnosis of malignant tumor.
authors.affiliation: Clinical Research Center, National Hospital Organization (NHO) Nagasaki Medical Center, Japan.
authors.forename: Sung Kwan
authors.initials: SK
authors.lastname: Bae
authors.forename: Seigo
authors.initials: S
authors.lastname: Abiru
authors.forename: Yukio
authors.initials: Y
authors.lastname: Kamohara
authors.forename: Satoru
authors.initials: S
authors.lastname: Hashimoto
authors.forename: Masashi
authors.initials: M
authors.lastname: Otani
authors.forename: Akira
authors.initials: A
authors.lastname: Saeki
authors.forename: Shinya
authors.initials: S
authors.lastname: Nagaoka
authors.forename: Kazumi
authors.initials: K
authors.lastname: Yamasaki
authors.forename: Atsumasa
authors.initials: A
authors.lastname: Komori
authors.forename: Masahiro
authors.initials: M
authors.lastname: Ito
authors.forename: Hikaru
authors.initials: H
authors.lastname: Fujioka
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Yatsuhashi
mesh_terms: D001650:Bile Duct Neoplasms / Q000175:diagnosis / Q000473:pathology; D001653:Bile Ducts, Intrahepatic / Q000473:pathology*; D001706:Biopsy; D018281:Cholangiocarcinoma / Q000175:diagnosis*; D002761:Cholangitis / Q000175:diagnosis* / Q000473:pathology; D003937:Diagnosis, Differential; D003951:Diagnostic Errors; D003952:Diagnostic Imaging; D006104:Granuloma, Plasma Cell / Q000175:diagnosis* / Q000473:pathology / Q000601:surgery; D006801:Humans; D008107:Liver Diseases / Q000175:diagnosis* / Q000473:pathology / Q000601:surgery; D008297:Male; D011300:Preoperative Care; D016896:Treatment Outcome