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H&E stains of a skin biopsy from a patient with blastic plasmacytoid dendritic cell neoplasm showing a dense infiltrate of medium-sized atypical cells with sparing of the epidermis (A, B). Immunohistochemical stains are positive for CD4 (C) and CD56 (D).
Abbreviation: H&E, hematoxylin and eosin.
