title: Secondary amyloidosis complicating psoriasis.
abstract: BACKGROUND
  Amyloidosis is a heterogeneous group of disorders characterized by extracellular deposition of fibrillar protein. Secondary amyloidosis occurs in patients with chronic infectious or inflammatory processes. Only 18 cases of secondary amyloidosis complicating psoriasis have been reported.
  
  
  OBJECTIVE
  We characterized secondary amyloidosis complicating psoriasis.
  
  
  METHODS
  We reviewed all cases of coexisting psoriasis and amyloidosis seen at the Mayo Clinic from 1950 to 1992. The clinical characteristics were summarized, and the literature was reviewed.
  
  
  RESULTS
  There were 28 cases of coexistent disease, and in five of these psoriasis was the only inflammatory condition preceding the development of secondary amyloidosis. Histopathologic confirmation with Congo red staining was available in four cases, and immunohistochemical confirmation of the characteristic amyloid A subtype was performed in two.
  
  
  CONCLUSIONS
  Follow-up of four patients supports the view that amyloidosis associated with psoriasis is an aggressive disease that may be fatal.
authors.affiliation: Department of Dermatology, Mayo Clinic, Rochester, MN 55905.
authors.forename: G P
authors.initials: GP
authors.lastname: Wittenberg
authors.forename: J R
authors.initials: JR
authors.lastname: Oursler
authors.forename: M S
authors.initials: MS
authors.lastname: Peters
mesh_terms: D000368:Aged; D000686:Amyloidosis / Q000209:etiology*; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008875:Middle Aged; D011565:Psoriasis / Q000150:complications*