Membranoproliferative glomerulonephritis (MPGN) represents a pattern of glomerular injury, characterized by mesangial proliferation and expansion, lobularization of the glomerular tufts, and double contours. Classification of MPGN has been updated in the 2010s and is now categorized according to the immunofluorescence microscopy findings. MPGN is now recognized as follows: Immunocomplexes-associated MPGN with complement over activation; MPGN with intramembranous dense deposits; and C3 glomerulopathy.
