We report a patient with cutaneous Rosai-Dorfman disease that presented on the right buttock, a red brown plaque with yellowish areas and red-brown satellite papulas. The histopathologic exam revealed inflammatory infiltrate predominantly of lymphocytes and histiocytes with wide and clear cytoplasm containing intact inflammatory cells (emperipolesis). Any other alteration in the physical exam and laboratorial was not found. The Rosai-Dorfman disease is a rare form of histiocytic proliferation and the strictly cutaneous form is still rarer. The aetiology is unknown and the clinical and histologic correlation enables the correct diagnosis.
Histiocytosis; Cutaneous Rosai-Dorfman disease; Emperipolesis
