Focal segmental glomerulosclerosis is a glomerular injury with typical morphology detectable by light microscopy. It has different histological subtypes and clinical symptoms. These different subtypes were recently systematized (Columbia classification). Focal segmental glomerulosclerosis is considered as the major type of podocytopathies, because podocytes are affected at each type of glomerular injury. Besides the primary forms of focal segmental glomerulosclerosis, an increased number of the secondary types are recognized. The wide use of drugs for renal protection in general and the long term administration of steroid therapy in some primary (idiopathic) cases are new elements among the therapeutic possibilities.
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