title: [Sinonasal teratocarcinosarcoma: clinicopathologic study and analysis].
abstract: OBJECTIVE
  To study the clinicopathologic features, immunophenotype, diagnosis and differential diagnosis of Sinonasal teratocarcinosarcoma (SNTCS).
  
  
  METHODS
  The clinical findings, morphologic features and immunohistochemical markers in one case of SNTCS were studied, and the relevant literatures were reviewed.
  
  
  RESULTS
  The Tumor tissue is composed of three layers, with mature and immature squamous epithelium nests, neural epithelial cells and olfactory neuroblastoma-like cells derived of ectoderm; Sarcomatoid components and bone tissue derived of mesoderm; The glandular and tubular structures part of which is adenocarcinoma and respiratory epithelium derived of endoderm; The fetal clear cell squamous epithelium is typical. In addition, diffuse large cytoplasm-with high light and cytoplasm with dark light has no obviously boundery. Immunohistochemical staining showed immune markers of different germ layers corresponding, squamous epithelium, glandular epithelium and respiratory epithelium were positive for CK and EMA, neural epithelial cells and olfactory neuroblastoma-like cells were positive for S-100, NSE and Syn, sarcomatoid area was positive for Vim, light dye area was positive for Vim, CD99 and CK, dark area was positive for NSE and GFAP.
  
  
  CONCLUSIONS
  SNTCS is a rare malignant tumor with the features of teratoma and carcinosarcoma, its histopathological and immunohistochemical features were typical, should be more drawn and sliced to avoid misdiagnosis and missed diagnosis.
authors.forename: Jing
authors.initials: J
authors.lastname: Wang
authors.forename: Jiya
authors.initials: J
authors.lastname: Du
mesh_terms: D000230:Adenocarcinoma; D002296:Carcinosarcoma / Q000175:diagnosis / Q000276:immunology / Q000473:pathology; D003937:Diagnosis, Differential; D018304:Esthesioneuroblastoma, Olfactory / Q000175:diagnosis / Q000276:immunology / Q000473:pathology; D006801:Humans; D009296:Nasal Cavity; D009669:Nose Neoplasms / Q000175:diagnosis / Q000276:immunology / Q000473:pathology; D013724:Teratoma / Q000175:diagnosis / Q000276:immunology / Q000473:pathology