title: Crescentic glomerulonephritis in IgA multiple myeloma: a case report.
abstract: BACKGROUND
  There are few reports of glomerulonephritis (GN) with crescents and a rapidly progressive course that lead to a diagnosis of a previously unsuspected B-cell dyscrasia.
  
  
  METHODS
  We report a case of rapidly progressive GN: the patient showed no evidence of etiology at the time of biopsy and was diagnosed as IgA multiple myeloma (MM) during investigation based on a renal biopsy. He presented diffuse proliferative and exudative GN and marked plasma cell infiltration of the kidney.
  
  
  CONCLUSIONS
  The present case raises the possibility that proliferative GN with crescents may be a rare mode of presentation of MM.
authors.affiliation: Glomerulopathy Section, Universidade Federal de São Paulo, São Paulo, Brazil.
authors.forename: Grace T
authors.initials: GT
authors.lastname: Moscoso-Solorzano
authors.forename: Marcus V
authors.initials: MV
authors.lastname: Madureira-Silva
authors.forename: Carlos
authors.initials: C
authors.lastname: Balda
authors.forename: Marcello F
authors.initials: MF
authors.lastname: Franco
authors.forename: Gianna
authors.initials: G
authors.lastname: Mastroianni-Kirsztajn