C3 and crescentic glomerulonephritis: Three patients with crescentic glomerulonephritis had positive immunofluorescence (one with positive IgM, IgG, IgA, C3, and C1q deposits, one with modest positive mesangial IgM, IgG, and C3, and another with positive IgG and C3 deposits) while four patients had negative immunological fluorescence [22,23,31,35,42,43].