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Giant Hemosiderotic Dermatofibroma: The Largest Giant Dermatofibroma Reported to Date.

Dermatofibroma (DF) is a relatively common benign fibrohistiocytic soft tissue tumor. It has a slightly greater incidence amongst females and typically presents itself during the midadult life as a slowly growing, firm dermal nodule, usually smaller than 2 cm in diameter, on the lower extremities. Giant DF is a rare clinical variant of DF characterized by unusually large size (>5 cm), which mimics malignant soft tissue tumor clinically. Twenty-six cases of giant DF have been reported so far. One of these giant DFs was a giant hemosiderotic DF. We report herein a case of a 47-year-old woman who presented with the largest DF reported in the literature to date. It was hemosiderotic.