Focal segmental glomerulosclerosis (FSGS) is a glomerular disease with a characteristic pathologic presentation that includes segmental scarring involving some but not all glomeruli. On immunofluorescence, deposits of immunoglobulin (Ig) M and C3 may be found in the areas of segmental scarring. Electron microscopy typically demonstrates diffuse epithelial cell foot process effacement and focal areas of retraction of glomerular basement membrane with collapse of the involved tuft (1)...