Focal glomerulonephritis.

Focal glomerulonephritis show a pathologic involvement of some glometuli and a normal aspect of the others. It happens in many different kidney diseases as SLE. Shonlein-Henoch syndrome, Goodpasture syndrome, recurrent hematuria. Although focal by light microscopy there is a diffuse pattern of immunoglobulins revealed by immunofluorescence techniques. There are clearly several different pathogenetic mechanisms and the factors which deterline the focal nature of the entity are poorly understood.