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[Unifocal skin location of Kaposi's sarcoma, mimicking melanoma: the role of excisional biopsy for the timely identification of an unusual pathology with potential fatal prognosis].

Kaposi's sarcoma is a mesenchimal malignant tumor with a very low incidence. Generally arising with purple cutaneous lesions, especially located to the limbs or the trunk, it's significantly associated to myelodeficient disorders, either primary or subsequent to viral infections, whose terminal stage it is considered (AIDS). Unique lesion in sporadic disease, without any other pathologies and at early stage, it has its elective treatment in surgical excision, just as in the reported case emphasizing the necessity for differential diagnosis with another malignant oncological disease, such as melanoma.