Fast Five Quiz: Mycosis Fungoides

Lauren C. Pinter-Brown, MD


November 01, 2021

Figure 1. Light micrograph of a section through a tumor (dark purple) in the skin of a patient with mycosis fungoides (cutaneous lymphoma).

The stages of mycosis fungoides are patch, plaque, and tumor. The earliest lesion seen in mycosis fungoides is an erythematous, brownish, scaly patch, which may show slight atrophy. Single or multiple lesions of variable diameters and locations develop, often in covered areas and particularly in the gluteal region and on the proximal thighs. In the plaque stage, lesions appear larger, with evident infiltration, along with the appearance of new lesions. The lesions are annular or horseshoe-shaped; they have an infiltrated base with raised, well-defined edges, and asymmetrical distribution. The lesions may also affect the face and the scalp. In the tumor stage, erythematous purplish papules or nodules of larger diameter are seen. These tumors can resemble mushrooms — a type of fungus — which is how this condition received its name.

Learn more about the stages of mycosis fungoides.


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