Sidney Hoskins, Spencer M. Vale, Ata S. Moshiri

Acute regression of a melanocytic neoplasm

  • Dermatology
  • Histology
  • Pathology and Forensic Medicine

AbstractImmune‐mediated regression of melanocytic neoplasms is predominantly lymphocytic, driven by CD8+ anti‐tumoral T‐cells and, rarely, natural killer cells. Histopathologic features of regression include effacement of the epidermis, replacement of tumor cells by a fibrotic stroma, varying degrees of chronic inflammation (usually lymphocytes) and melanophages, as well as vascular ectasia and angioplasia. The understanding of regression and the complex immune response in melanoma has led to the development of targeted immunotherapy in melanoma. Here, we report a case of near‐complete regression of a melanocytic neoplasm associated with neutrophilic and eosinophilic inflammation, suggesting a non‐traditional pathway of regression that has yet to be explored.

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