title: Choledochal cyst rupture with an intrahepatic pseudocyst mimicking hepatic mesenchymal hamartoma in an infant.
abstract: Spontaneous choledochal cyst rupture and consequent biliary peritonitis are rare in children. Here, we report a unique case of intrahepatic bile duct rupture of choledochal cyst type IV that resulted in loculated biliary peritonitis with an intrahepatic pseudocyst mimicking a hepatic mesenchymal hamartoma in a 3-month-old boy. Magnetic resonance cholangiopancreatography can help differentiate these conditions. Regardless of the location, pseudocysts resulting from biliary peritonitis should be considered in cases of choledochal cysts with adjacent fluid collection or cystic lesions.
authors.affiliation: Department of Radiology and Research Institute of Radiological Science, Severance Children's Hospital, Yonsei University College of Medicine, Seoul, Korea 120-752.
authors.forename: Min-Yung
authors.initials: MY
authors.lastname: Chang
authors.affiliation: Department of Radiology and Research Institute of Radiological Science, Severance Children's Hospital, Yonsei University College of Medicine, Seoul, Korea 120-752.
authors.forename: Myung-Joon
authors.initials: MJ
authors.lastname: Kim
authors.affiliation: Department of Pediatric Surgery, Severance Children's Hospital, Yonsei University College of Medicine, Seoul, Korea 120-752.
authors.forename: Seok Joo
authors.initials: SJ
authors.lastname: Han
authors.affiliation: Department of Pathology, Severance Hospital, Yonsei University College of Medicine, Seoul, Korea 120-752.
authors.forename: Hye Min
authors.initials: HM
authors.lastname: Kim
authors.affiliation: Department of Radiology and Research Institute of Radiological Science, Severance Children's Hospital, Yonsei University College of Medicine, Seoul, Korea 120-752. Electronic address: mjl1213@yuhs.ac.
authors.forename: Mi-Jung
authors.initials: MJ
authors.lastname: Lee
mesh_terms: D001649:Bile Duct Diseases / Q000150:complications / Q000175:diagnosis*; D001653:Bile Ducts, Intrahepatic / Q000473:pathology*; D049448:Cholangiopancreatography, Magnetic Resonance / Q000379:methods*; D015529:Choledochal Cyst / Q000150:complications / Q000175:diagnosis*; D003937:Diagnosis, Differential; D006222:Hamartoma / Q000175:diagnosis; D006801:Humans; D007223:Infant; D008107:Liver Diseases / Q000150:complications / Q000175:diagnosis*; D008297:Male; D012422:Rupture, Spontaneous
keywords: Choledochal cyst; MR; Mesenchymal hamartoma; Peritonitis; Pseudocyst