An unusual histologic variant of necrobiotic xanthogranuloma

Am J Dermatopathol. 2012 Apr;34(2):e22-6. doi: 10.1097/DAD.0b013e3182222aa8.

Abstract

Necrobiotic xanthogranuloma (NXG) usually shows a stereotypical histopathologic presentation. However, few unusual cases have been published. We present a patient with NXG showing exceptional histopathologic features. NXG in our patient presents with exclusively dermal granulomatous inflammation mimicking interstitial granuloma annulare. Not only subcutaneous involvement, but also, evident zones of degenerated collagen, foam cells, and cholesterol clefts were missing. Moreover, the case shows overlaps with recently published granulomatous scleromyxedema. Some common clinical and histopathologic features of NXG and scleromyxedema might be based on shared underlying paraproteinemia.

Publication types

  • Case Reports

MeSH terms

  • Female
  • Humans
  • Immunoglobulins, Intravenous / therapeutic use
  • Middle Aged
  • Monoclonal Gammopathy of Undetermined Significance / complications
  • Necrobiotic Xanthogranuloma / complications
  • Necrobiotic Xanthogranuloma / drug therapy
  • Necrobiotic Xanthogranuloma / pathology*

Substances

  • Immunoglobulins, Intravenous