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Desmoplastic cellular blue nevi

M Michal1, Z Kerekes, Z Kinkor

  • 1Sikls Department of Pathology, Medical Faculty, Charles University, Pilsen, Czech Republic.

The American Journal of Dermatopathology
|June 1, 1995
PubMed
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This study details five cellular blue nevus (CBN) cases with desmoplastic reactions. Nevus cells produced collagen, distinguishing them from common CBN and impacting differential diagnosis.

Area of Science:

  • Dermatopathology
  • Oncology
  • Immunohistochemistry

Background:

  • Cellular blue nevus (CBN) is a melanocytic proliferation.
  • Desmoplastic reactions involve collagen deposition around tumor cells.
  • Understanding the origin of desmoplasia in CBN is crucial for diagnosis.

Purpose of the Study:

  • To investigate the cellular origin of abundant desmoplastic reactions in five cases of cellular blue nevus.
  • To differentiate desmoplastic CBN from common CBN using immunohistochemical markers.
  • To discuss the implications for differential diagnosis.

Main Methods:

  • Histopathological examination of five cellular blue nevus cases.
  • Immunohistochemical staining using antibodies for S-100 protein, HMB-45, smooth muscle actin, and desmin.

Related Experiment Videos

  • Microscopic comparison between desmoplastic CBN and common CBN.

    • Main Results:

    • All five cases exhibited cellular blue nevus with significant desmoplastic stroma.
    • Nevus cells within desmoplastic regions showed strong positive reactions for S-100 protein and HMB-45.
    • Nevus cells were negative for smooth muscle actin and desmin, indicating they produced the collagen deposits.

    Conclusions:

    • The abundant collagen in desmoplastic CBN originates from the nevus cells themselves.
    • Desmoplastic cellular blue nevus presents a distinct microscopic appearance compared to common CBN.
    • Recognition of these features is essential for accurate differential diagnosis of skin lesions.