title: Orbital Paraganglioma and Succinate Dehydrogenase Staining for Genetic Testing Triage and Prognosis.
abstract: OBJECTIVE
  To describe the rare occurrence of a paraganglioma in the orbit and how to triage for genetic testing and assess the prognosis with succinate dehydrogenase subunit B (SDHB) immunohistochemical staining.
  
  
  METHODS
  Case report.
  
  
  METHODS
  A 47-year-old 'healthy' male presented with painless exophthalmos and diplopia secondary to an infraorbital tumour mass.
  
  
  RESULTS
  The orbital biopsy was diagnosed as paraganglioma with positive staining with SDHB.
  
  
  CONCLUSIONS
  The rarity of an orbital paraganglioma was followed by the clinical search for a possible occult extraorbital primary paraganglioma. SDHB staining helped in the triage for genetic testing and gave an idea about the prognosis for this tumour.
authors.affiliation: Department of Anatomical Pathology, St Vincent's Hospital, Melbourne. Vic., Australia.
authors.forename: Cesar M
authors.initials: CM
authors.lastname: Salinas-La Rosa
keywords: Familial syndrome; Orbit; Paraganglioma; Succinate dehydrogenase immunohistochemical stain