Coexistence of Anti Neutrophilic Cytoplasmic Antibody (ANCA) Negative Renal Limited Vasculitis and Atypical- Hemolytic Uremic Syndrome (aHUS).

Small vessel necrotizing vasculitis is divided into two groups; Immune complex mediated and Pauci immune vasculitis. Hemolytic uremic syndrome (HUS) is a rare disease manifested as microangiopathic hemolytic anemia, thrombocytopenia and renal involvement. The coexistence of ANCA negative vasculitis and atypical HUS (aHUS) is rare.