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Desmoplastic neurotropic melanoma

H Tsao1, A J Sober, R L Barnhill

  • 1Department of Dermatology, Harvard Medical School, Boston, MA, USA.

Seminars in Cutaneous Medicine and Surgery
|June 1, 1997
PubMed
Summary

Desmoplastic neurotropic melanoma (DNM), a rare spindle cell cancer, often presents challenges in diagnosis due to variable appearance. Despite diagnostic difficulties, DNM may offer a better survival prognosis compared to other melanoma types.

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Area of Science:

  • Dermatology
  • Oncology
  • Pathology

Background:

  • Desmoplastic neurotropic melanoma (DNM) is an uncommon subtype of spindle cell melanoma.
  • DNM predominantly affects the head and neck region in elderly individuals.
  • Variable clinical presentation, including lack of pigmentation, complicates early diagnosis.

Purpose of the Study:

  • To describe the key histological and immunohistochemical features of DNM.
  • To highlight diagnostic challenges associated with DNM.
  • To compare the clinical behavior and survival outcomes of DNM with other melanoma variants.

Main Methods:

  • Review of histological findings in DNM cases.
  • Analysis of immunohistochemical staining patterns (S-100, HMB-45).

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  • Comparison of clinical presentation, treatment, and survival data with other melanoma types.

    • Main Results:

    • Histology shows lentiginous melanocytic proliferation with atypia and dermal spindle cells.
    • S-100 immunostaining is typically positive, while HMB-45 is often negative.
    • Surgery is the primary treatment; DNM may have a better survival rate than other melanomas.

    Conclusions:

    • DNM presents diagnostic challenges due to its variable appearance and histological features.
    • Immunohistochemistry aids in diagnosis, with characteristic S-100 positivity and HMB-45 negativity.
    • Despite diagnostic hurdles, DNM might have a more favorable prognosis compared to other melanoma subtypes.