Cutaneous T-cell immunoblastic sarcoma1
Jaye E. Benjamin, M.D.
Wilma F. Bergfeld, M.D.
Raymond R. Tubbs, D.O.
James T. McMahon, Ph.D.
We describe a rare malignant neoplasm, cutaneous T-cell immunoblastic sarcoma (IBS-T). Clinical examination revealed multiple 3–6 mm salmon-pink papules. On biopsy, these papules contained perivascular dermal infiltrates with atypical mononuclear cells, characterized by immunohistochemistry and electron microscopy as T lymphocytes with phenotype T3+, T11+, Ia+ and B1-,κ-,λ-, which exhibited focal epidermotropism.