- Multifocal stenosing ulcerations of the small intestine revealing vasculitis associated with C2 deficiency. Perlemuter, G., Chaussade, S., Soubrane, O., Degoy, A., Louvel, A., Barbet, P., Legman, P., Kahan, A., Weiss, L., Couturier, D. Gastroenterology (1996)