title: Primary central nervous system vasculitis: comparison of patients with and without cerebral amyloid angiopathy.
abstract: OBJECTIVE
  To describe the clinical features and outcomes of patients with primary central nervous system vasculitis (PCNSV) and cerebral amyloid angiopathy (CAA) from a large cohort of consecutive patients with PCNSV treated at a single institution.
  
  
  METHODS
  We identified 101 consecutive patients with PCNSV admitted between January 1983 and December 2003. PCNSV diagnoses were based on findings from a central nervous system (CNS) biopsy (n = 31) and conventional angiography (n = 70). CNS tissue specimens from 49 cases were examined histologically, and 49 were stained for amyloid deposits. Those with vascular amyloid deposits (CAA) were compared with those without histological evidence of amyloid deposition.
  
  
  RESULTS
  Eight cases (26%) with CNS biopsy specimens positive for PCNSV also showed findings of CAA. Compared with patients with PCNSV only, these patients were older at diagnosis, predominantly male, had a more acute onset, a higher frequency of cognitive dysfunction and showed prominent gadolinium-enhanced leptomeningeal lesions with MRI. Histologically, all had a granulomatous vascular inflammatory pattern. Six patients responded promptly to therapy. Outcomes at last follow-up were similar in the two groups.
  
  
  CONCLUSIONS
  PCNSV with CAA appears to form a clinical subset of PCNSV. The vasculitis influences the clinical findings to a greater degree than the presence of amyloid deposits in the vessels.
authors.affiliation: Department of Neurology, Mayo Clinic, 200 First Street SW, Rochester, MN 55905, USA.
authors.forename: C
authors.initials: C
authors.lastname: Salvarani
authors.forename: R D
authors.initials: RD
authors.lastname: Brown
authors.forename: K T
authors.initials: KT
authors.lastname: Calamia
authors.forename: T J H
authors.initials: TJ
authors.lastname: Christianson
authors.forename: J
authors.initials: J
authors.lastname: Huston
authors.forename: J F
authors.initials: JF
authors.lastname: Meschia
authors.forename: C
authors.initials: C
authors.lastname: Giannini
authors.forename: D V
authors.initials: DV
authors.lastname: Miller
authors.forename: G G
authors.initials: GG
authors.lastname: Hunder