Glomerular diseases may be classified as acute or chronic, primary or secondary, hereditary or acquired, proliferative or non-proliferative etc. The most commonly used is the classification according to the histopathological finding. For certain types of glomerulonephritides histopathological image, as well as clinical presentation, may vary widely. A while ago there was no classification based on the pathogenesis of certain types of glomerular diseases. However, as scientists ellucidate the underlying pathogenetic mechanism, current classifications change. The latter is best shown at the example of membranoproliferative glomerulonephritis.