title: Russell bodies in a skin biopsy: a case report.
abstract: BACKGROUND
  The presence of eosinophilic bodies in a skin biopsy can be found in a variety of situations and this may present a challenge to the pathologist. The differential diagnosis of these eosinophilic structures include microorganisms such as histoplasmosis or cryptococcosis, fungi, Michaelis-Gutmann bodies, deposits of amyloid or immunoglobulins, colloid bodies or elastic bodies.
  
  
  METHODS
  During a routine examination of a skin biopsy with actinic keratosis taken from the cheek of a 61-year-old man, clusters of eosinophilic bodies were seen within an inflammatory infiltrate in the dermis, both intracytoplasmic and extracellular. Using additional immunohistochemical staining, these structures were identified as polyclonal Russell bodies.
  
  
  CONCLUSIONS
  The differential diagnosis of intracytoplasmic eosinophilic structures in a skin biopsy includes Russell bodies, an uncommon finding that may be associated with chronic inflammatory conditions.
authors: Department of Pathology, VU University Medical Center, De Boelelaan 1117, 1081 HV Amsterdam, The Netherlands.
authors: Joanne
authors: J
authors: Verheij
authors: Elisabeth H
authors: EH
authors: Jaspars
authors: Paul van der
authors: Pv
authors: Valk
authors: Lawrence
authors: L
authors: Rozendaal