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The biopsy specimens showed an area of central dermal necrosis surrounded by a mixed infiltrate of lymphocytes, histiocytes, plasma cells, and neutrophils. Occasional multinucleate giant cells were present. A Gomori methenamine-silver stain revealed yeast forms, some of which had a round or an elongated bud (Figure 4). The fungal culture yielded Sporothrix schenkii in a characteristic dark, leatherlike plaque (Figure 5).
An Ulcerating Nodule on the Arm. Arch Dermatol. 1998;134(10):1279-1284. doi: