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Mycosis fungoides simulating acanthosis nigricans.

In this paper, an unusual papillomatous variant of the plaque stage of mycosis fungoides with clinical similarities to acanthosis nigricans is described. In contrast to the classic plaque stage of mycosis fungoides, the dermal infiltrates in this patient showed a rather monomorphous proliferation of blast-like cells that had little or no tendency to infiltrate the epidermis.