title: Histopathological and immunophenotypic features of testicular tumour of the adrenogenital syndrome.
abstract: OBJECTIVE
  Testicular tumour of the adrenogenital syndrome (TTAGS) is a rare neoplasm histologically resembling Leydig cell tumour (LCT). We report six cases of TTAGS and analyse histopathological and immunophenotypical features that distinguish TTAGS from LCT.
  
  
  RESULTS
  Six cases of congenital adrenal hyperplasia with bilateral TTAGS were examined histologically and immunohistochemically and compared to seven cases of testicular LCT. TTAGS was characterized histologically by sheets of polygonal cells separated by dense fibrous tissue with focal lymphocyte infiltration. All cases of TTAGS lacked cytological atypia except for one, which displayed scattered large pleomorphic, nuclei with one or two prominent nucleoli and sporadic mitotic figures. Immunohistochemically, all cases of TTAGS showed diffuse and strong positivity for CD56 and negative reactivity for androgen receptor. Reactivity for synaptophysin varied from focal (five cases) or diffuse (one case). In contrast, LCT displayed focal weak to moderate or negative reactivity for CD56 and focal weak or negative reactivity for synaptophysin, but positive reactivity for androgen receptor in six of seven cases.
  
  
  CONCLUSIONS
  In addition to clinical information, biochemical profile and histopathological findings, our results suggest that immunohistochemistry using a panel of antibodies including CD56, synaptophysin and androgen receptor is helpful in differentiating TTAGS from LCT.
authors.affiliation: Department of Pathology, First Affiliated Hospital and Zhongshan School of Medicine, Sun Yat-Sen University, Guangzhou, China.
authors.forename: Zhuo
authors.initials: Z
authors.lastname: Wang
authors.forename: Shicong
authors.initials: S
authors.lastname: Yang
authors.forename: Huijuan
authors.initials: H
authors.lastname: Shi
authors.forename: Hong
authors.initials: H
authors.lastname: Du
authors.forename: Ling
authors.initials: L
authors.lastname: Xue
authors.forename: Liantang
authors.initials: L
authors.lastname: Wang
authors.forename: Yu
authors.initials: Y
authors.lastname: Dong
authors.forename: Anjia
authors.initials: A
authors.lastname: Han
mesh_terms: D000293:Adolescent; D000312:Adrenal Hyperplasia, Congenital / Q000150:complications / Q000378:metabolism / Q000473:pathology*; D014408:Biomarkers, Tumor / Q000378:metabolism; D019002:CD56 Antigen / Q000378:metabolism; D002466:Cell Nucleolus / Q000473:pathology; D002467:Cell Nucleus / Q000473:pathology; D002648:Child; D002675:Child, Preschool; D006801:Humans; D008297:Male; D011944:Receptors, Androgen / Q000378:metabolism; D016708:Synaptophysin / Q000378:metabolism; D013736:Testicular Neoplasms / Q000150:complications / Q000378:metabolism / Q000473:pathology*
chemical_list: D014408:Biomarkers, Tumor; D019002:CD56 Antigen; C522918:NCAM1 protein, human; D011944:Receptors, Androgen; D016708:Synaptophysin