title: The importance of skip lesions in temporal arteritis.
abstract: OBJECTIVE
  To determine the frequency of skip lesions in an unselected series of temporal artery biopsies and compare the results with other series.
  
  
  METHODS
  The study was a retrospective review of 102 consecutive temporal artery biopsies taken in a five year period (1992-1997) in one large hospital.
  
  
  RESULTS
  35 cases (34.3%) showed evidence of active cranial vasculitis with pathological evidence of inflammation of the intima or media, with or without giant cells. Three of these cases (8.5%) showed apparent skip lesions: normal intima, media, and adventitia in one segment while in other segments there was clear evidence of active vasculitis. Immunocytochemical stains for leucocyte common antigen (LCA) and CD15 were helpful in identifying the absence of intimal or medial inflammatory cell infiltrates within skip lesions. Skip lesions have been described in up to 28.3% of cases in some series, while others have not found evidence of skip lesions or have identified them in a much smaller percentage of cases.
  
  
  CONCLUSIONS
  In this series skip lesions were relatively rare, accounting for 8.5% of cases of active vasculitis. The degree of inflammation in temporal arteritis is discontinuous. Immunostaining for inflammatory cells, for example LCA and CD15, may be helpful in identifying the presence of an inflammatory cell infiltrate in skip lesion segments of the temporal artery.
authors.affiliation: Department of Pathology, Queen Alexandra Hospital, Portsmouth, UK. david@poller.demon.co.uk
authors.forename: D N
authors.initials: DN
authors.lastname: Poller
authors.forename: Q
authors.initials: Q
authors.lastname: van Wyk
authors.forename: M J
authors.initials: MJ
authors.lastname: Jeffrey
mesh_terms: D001706:Biopsy; D013700:Giant Cell Arteritis / Q000378:metabolism / Q000473:pathology*; D006801:Humans; D007124:Immunoenzyme Techniques; D017493:Leukocyte Common Antigens / Q000378:metabolism; D016256:Lewis X Antigen / Q000378:metabolism; D012189:Retrospective Studies; D013699:Temporal Arteries / Q000378:metabolism / Q000473:pathology*; D017539:Tunica Intima / Q000473:pathology; D017540:Tunica Media / Q000473:pathology
chemical_list: D016256:Lewis X Antigen; D017493:Leukocyte Common Antigens