title: Hepatic involvement of Langerhans cell histiocytosis in children--imaging findings of computed tomography, magnetic resonance imaging and magnetic resonance cholangiopancreatography.
abstract: BACKGROUND
  Langerhans cell histiocytosis is a rare disease that occurs mainly in children, and hepatic involvement is generally a poor prognostic factor.
  
  
  OBJECTIVE
  To describe CT and MRI findings of hepatic involvement of Langerhans cell histiocytosis in children, especially the abnormal bile duct manifestation on magnetic resonance cholangiopancreatography (MRCP).
  
  
  METHODS
  Thirteen children (seven boys, six girls; mean age 28.9 months) were diagnosed with disseminated Langerhans cell histiocytosis. They underwent CT (n = 5) or MRI (n = 4), or CT and MRI examinations (n = 4) to evaluate the liver involvement.
  
  
  RESULTS
  Periportal abnormalities presented as band-like or nodular lesions on CT and MRI in all 13 children. The hepatic parenchymal lesions were found in the peripheral regions of the liver in seven children, including multiple nodules on MRI (n = 6), and cystic-like lesions on CT and MRI (n = 3). In 11 of the 13 children the dilatations of the bile ducts were observed on CT and MRI. Eight of the 13 children underwent MR cholangiopancreatography, which demonstrated stenoses or segmental stenoses with slight dilatation of the central bile ducts, including the common hepatic duct and its first-order branches. The peripheral bile ducts in these children showed segmental dilatations and stenoses.
  
  
  CONCLUSIONS
  Stenosis of the central bile ducts revealed by MR cholangiopancreatography was the most significant finding of liver involvement in Langerhans cell histiocytosis in children.
authors.affiliation: Department of Radiology, Children's Hospital of Fudan University, 399 Wanyuan Road, Minhang District, Shanghai, 201102, People's Republic of China.
authors.forename: Yingyan
authors.initials: Y
authors.lastname: Shi
authors.forename: Zhongwei
authors.initials: Z
authors.lastname: Qiao
authors.forename: Chunmei
authors.initials: C
authors.lastname: Xia
authors.forename: Ying
authors.initials: Y
authors.lastname: Gong
authors.forename: Haowei
authors.initials: H
authors.lastname: Yang
authors.forename: Guoping
authors.initials: G
authors.lastname: Li
authors.forename: Mier
authors.initials: M
authors.lastname: Pa
mesh_terms: D001706:Biopsy; D002675:Child, Preschool; D049448:Cholangiopancreatography, Magnetic Resonance; D003937:Diagnosis, Differential; D005260:Female; D006646:Histiocytosis, Langerhans-Cell / Q000150:complications* / Q000175:diagnosis*; D006801:Humans; D007223:Infant; D008107:Liver Diseases / Q000175:diagnosis* / Q000209:etiology*; D008279:Magnetic Resonance Imaging; D008297:Male; D011379:Prognosis; D014057:Tomography, X-Ray Computed