C3 and ganglioneuroma: LM: Mesangial proliferative GN with double contours of GBM and cellular interposition Ribbon-shaped dense osmiophilic intramembranous and mesangial deposits Crescents more frequent than in C3GN IF: Dominant C3 deposition (at least two orders of magnitude more intense than any other immune reactant) EM: Linear-appearing, highly electron-dense deposits in the GBM, tubular basement membranes, Bowman's capsule and mesangium