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CD34‐positive cellular blue nevi Note
Author(s) -
Smith Kathleen J.,
Germain Marguerite,
Williams John,
Skelton Henry G.
Publication year - 2001
Publication title -
journal of cutaneous pathology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.597
H-Index - 75
eISSN - 1600-0560
pISSN - 0303-6987
DOI - 10.1034/j.1600-0560.2001.028003145.x
Subject(s) - immunohistochemistry , cd34 , pathology , staining , dermis , stain , medicine , biology , stem cell , microbiology and biotechnology
Background: Although cellular blue nevi (CBN) are well known and characterized, the histopathologic and clinical spectrum of these tumors continues to evolve. We report four CBN with a distinctive histologic and immunohistochemical pattern. Methods: The histologic features and immunohistochemical staining for S‐100 protein, HMB‐45, Bcl‐2 and CD34 of four CBN with distinctive features were evaluated using routine methods and compared to common CBN. Results: All four of these distinctive CBN where known to be congenital, and all showed aggregates of plump spindled cells with round to oval nuclei in aggregates and more slender spindled cells with thin wavy nuclei. The slender, spindled cells showed an infiltrative pattern laterally into the dermis and deep into the subcutaneous fat. All four tumors showed diffuse expression of an immunohistochemical stain for CD34, as well as for S‐100 protein, Bcl‐2, and HMB‐45. Conclusion: Positive immunohistochemical staining with the progenitor marker CD34 defines a subset of CBN. These tumors appear to fit within the spectrum of neurocristic cutaneous hamartomas and may arise from more primitive neurocristically derived cells. Further follow‐up of these tumors will be necessary to determine whether this subset of CBN defines a subset with a characteristic biologic behavior.