title: [Clinicopathological study of non-Langerhans cell histiocytosis in central nervous system].
abstract: OBJECTIVE
  To explore the clinicopathological features and imaging characteristics of non-Langerhans cell histiocytosis in central nerve system, thus to facilitate the diagnosis and differential diagnosis.
  
  
  METHODS
  A total of ten cases were enrolled in the study, with seven cases of Rosai-Dorfman disease (RDD) and three cases of xanthoma disseminatum (XD). Data on the clinicopathological features, imaging, immunophenotype and prognosis were collected and analyzed.
  
  
  RESULTS
  Seven patients with RDD, 5 males and 2 females with the mean age of 46.7 years old, all presented as dural-based or intraparenchymal hypo- to isointense lesions on T1 and T2 with post-contrast enhancement. The polymorphous admixture of histiocytes, lymphocytes and plasma cells was observed in a fibrous stroma, with emperipolesis of some histiocytes. The immunohistostaining of CD11c, CD68, MAC387 and S-100 was positive in the histiocytes, while the staining of CD1α was negative. Five patients recovered after the operation, while one patient died of the disease. All the 3 XD patients were female, with the median age of 20.7 years old. All XD patients presented as multiple intraparenchymal hypointense lesions on T1 and hyperintense lesions on T2 with post-contrast enhancement. The infiltration of foam-like histiocytes, a few Touton giant cells, lymphocytes and eosnophils was observed in all XD patients. The immunohistostaining of CD68 and CD11c was positive in the histiocytes and that of MAC387 partly positive, while the staining of S-100 and CD1α was negative. One XD patient survived well, while another one died of the disease.
  
  
  CONCLUSIONS
  The diagnosis of RDD and XD should be based on their typical morphology and immunophenotype and should be differentiated from Langerhans cell histiocytosis and other non-Langerhans cell histiocytosis. Non-Langerhans cell histiocytosis in central nerve system often presents untypical clinical presentation and imaging features, thus the communication and cooperation between clinician and pathologist is needed.
authors.forename: Tingting
authors.initials: T
authors.lastname: Zhang
authors.forename: Yongjuan
authors.initials: Y
authors.lastname: Fu
authors.forename: Dehong
authors.initials: D
authors.lastname: Lu
authors.forename: Cunjiang
authors.initials: C
authors.lastname: Li
authors.affiliation: Department of Pathology, Xuanwu Hospital of Capital Medical University, Beijing 100053, China; Email: yueshanpiao@126.com.
authors.forename: Yueshan
authors.initials: Y
authors.lastname: Piao
mesh_terms: D000328:Adult; D015703:Antigens, CD / Q000378:metabolism; D015214:Antigens, Differentiation, Myelomonocytic; D003937:Diagnosis, Differential; D005260:Female; D006646:Histiocytosis, Langerhans-Cell; D015616:Histiocytosis, Non-Langerhans-Cell / Q000473:pathology*; D015618:Histiocytosis, Sinus / Q000378:metabolism / Q000473:pathology*; D006801:Humans; D007150:Immunohistochemistry; D008297:Male; D008875:Middle Aged; D009420:Nervous System; D011956:Receptors, Cell Surface; D000098902:CD163 Antigen; D000097382:CD68 Molecule
chemical_list: D015703:Antigens, CD; D015214:Antigens, Differentiation, Myelomonocytic; D011956:Receptors, Cell Surface; D000098902:CD163 Antigen; C067980:CD68 antigen, human; D000097382:CD68 Molecule