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Macular arteritis (MA) is the denomination for a new type of cutaneous medium-size vessels vasculitis, clinically characterized by erythemato-violaceous or brownish, reticulated and asymptomatic macules. Histopathological examination demonstrates a lymphocytic arteritis. Case Report: A 35-year-old Caucasian man, with no smoking habits or relevant medical history presented with a 2-months history of cutaneous eruption on his limbs and trunk. He denied other complaints and the general physical examination was regular. The dermatological examination revealed multiples nontender and erythematous-violaceous macules, with linear and reticulated configuration. Cuta- neous periarteritis nodosa (CPN) was the main diagnosis proposed. Laboratory and radiological evaluation showed no underlying systemic disease. Pathological examination revealed a medium-sized vessel at the junction of the deep reticular dermis and the hypodermis, surrounded by a predominantly lymphocytic inflammatory infiltrate and fibrin deposits in the lumen, which were compatible with MA. Conclusion: MA is a poorly reported cutaneous vasculitis in the worldwide literature. The diagnosis is primarily histological and the CPN is the main clinical differential diagnosis. KEYWORDS – Arteritis; Skin Diseases; Hyperpigmentation.

ARTERITE MACULAR – A NOVA VASCULITE CUTÂNEA DOS VASOS DE MÉDIO CALIBRE