Squamomelanocytic tumor: an unusual and distinctive entity of uncertain biological potential

Am J Dermatopathol. 2009 Jul;31(5):495-8. doi: 10.1097/DAD.0b013e31819b4077.

Abstract

We report a case of a squamomelanocytic tumor of the skin. Clinically, the lesion was felt to be a melanocytic or vascular tumor but histologically was characterized by epithelioid cells with focal squamous differentiation. Immunohistochemical staining showed that half of cells stained with MNF116 and a smaller proportion stained with S100 and Melan A. A third population did not stain with either set of antigens. The lesion has some similarities to a melanocytic matricoma but no evidence of matrical differentiation. The biological potential of this distinctive tumor is not known because so few have been reported.

MeSH terms

  • Aged
  • Antimetabolites, Antineoplastic / therapeutic use
  • Fluorouracil / therapeutic use
  • Humans
  • Immunohistochemistry
  • Keratosis, Actinic / drug therapy
  • Male
  • Melanocytes / pathology
  • Neoplasms, Complex and Mixed / metabolism
  • Neoplasms, Complex and Mixed / pathology*
  • Skin Neoplasms / metabolism
  • Skin Neoplasms / pathology*

Substances

  • Antimetabolites, Antineoplastic
  • Fluorouracil