A Tangled Autoimmune Trio: Multiple Sclerosis, Systemic Lupus Erythematosus and Antineutrophil Cytoplasmic Antineutrophil Cytoplasmic Antibody Vasculitis.

The coexistence of multiple autoimmune diseases in the same individual is unusual and has received little attention in the literature. We present a young female patient with multiple sclerosis, systemic lupus erythematosus, and biopsy-proven renal proteinase 3 antineutrophil cytoplasmic antibodyassociated vasculitis who responded well to intravenous rituximab clinically and serologically.