Abstract: Neutrophilic dermatosis of the dorsal hands is considered a rare and localized variant of Sweet's syndrome. Although the etiology is unknown, there are reports of association with infections, neoplasias, autoimmune diseases and medications. Histopathology shows a dense neutrophilic inflammatory infiltrate in the dermis. Treatment is based on the administration of systemic corticosteroids; however, a combination of medications is useful, given the frequency of relapses. The authors report a classic and clinically exuberant case of neutrophilic dermatosis of the dorsal hands, with excellent response to oral dapsone treatment, and offer a brief literature review.

Abstract TNF alpha antagonist-induced lupus-like syndrome is a rare condition which predominantly affects women (4:1). The average age of onset is 46-51 years. It occurs after exposure to TNF alpha antagonist and disappears after discontinuation of such agents. The pathogenic mechanism for development of the TNF alpha antagonist-induced lupus-like syndrome is not fully defined. It is believed that the medication induces apoptosis, leading to an accumulation of nucleosomal antigens of apoptotic cells. This would cause autoantibodies to be produced by susceptible individuals. The most common cutaneous manifestations include maculopapular exanthem, malar rash, alopecia, photosensitivity and, more rarely, vasculitis. Extracutaneous manifestations include: fever, weight loss, arthritis or arthralgia, myositis and hematological abnormalities. Antinuclear antibody may be positive in 80% of cases and anti-histone antibody is considered a disease marker for TNF alpha antagonist-induced lupus-like syndrome. Treatment corresponds to drug discontinuation. We report a rare case of sub-acute cutaneous lupus erythematosus with leukocytoclastic vasculitis induced by adalimumab in a 42-year-old patient.

Relata-se o caso de uma paciente com doença de Rosai-Dorfman cutânea que apresentava na região glútea direita uma placa eritemato-acastanhada infiltrada com áreas amareladas e pápulas eritemato-acastanhadas perilesionais. O exame anatomopatológico revelou infiltrado inflamatório predominantemente de linfócitos e histiócitos de citoplasma amplo, claro e contendo células inflamatórias íntegras (emperipolese). Nenhuma outra alteração ao exame físico e laboratorial foi encontrada. A doença de Rosai-Dorfman é uma forma rara de proliferação histiocitária e o acometimento estritamente cutâneo é ainda mais raro. Sua etiologia é desconhecida e a correlação clinicopatológica permitiu o diagnóstico dessa enfermidade.

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.