<prompt> Crescents are characteristically seen inMCDRPGNMPGNFSGS  <response>: Ans. b RPGN Ref Robbins 7th975; TABLE 20-6.Type I RPGN Anti-GBM Antibody: Idiopathic; Goodpasture syndromeType II RPGN Immune Complex: Idiopathic; Postinfectious; SLE; Henoch-Schonlein purpura IgAType III RPGN Pauci-lmmune: ANCA asso; Idiopathic; WG; Microscopic PANmicroscopic polyangiitisGlomerulopathiesDiseaseMost frequent presentationPathogenesisLight microscopyFluorescence microscopyElectron microscopyPoststrepto- coccal GNAcute nephritisAb mediated circulating or planted antigenDiffuse prolife- ration; leukocytic infiltrationGranular IgG and C3 in GBM and mesangiumSubepithelial humpsGoodpasture syndromeRapidly progressive GNAnti-GBM COL 4-A3 antigenProliferation; crescentsLinear IgGC3 fibrin in crescentsNo deposits; GBM disruptions; fibrinIdiopathic RPGNRapidly progressive GNAnti-GBM ab. Immune complex. ANCA-asso. complex.Proliferation; focal necrosis; crescentsLinear lgGC3 Granular IgG or IgA or IgM negative or equivocalNo deposits Deposits may be present.Membranous glomrulopathyNephrotic syndromeIn situ ab mediatd; antigen unkownDiffuse capillary wall thickeningGranular IgG and C3; diffuseSubepithelial depositsMinimal change diseaseNephrotic syndromeUnknown, loss of glom polyanion; podocyte injuryNormal; lipid in tubulesNegativeLoss of foot processes; no depositsFocal segmental glomerulo- sclerosisNephrotic syndrome; non- nephrotic proteinuriaUnknown, Ablation nephropathy Plasma factor ?; podpcyte injuryFocal and segmental sclerosis and hyalinosisFocal; IgM and C3Loss of foot processes; epithelial denudationMembrano- proiiferative GN MPGN Type INephrotic syndromeImmune complexMesangial proliferation; BM thickening splitting.1 IgG C3; Clq C41 Subendothelial depositsDense deposit disease MPGN Type IIHematuria CRFAutoantibody; alternative complement pathway II C3 - IgG; no Clq or C4II Dense depositsIgA nephropathyRecurrent hematuria or proteinuriaUnknown;Focal proliferative GN; mesangial wideningIgA - IgG, IgM, and C3 in mesangiumMesangial and paramesangial dense-depositsChronic GNCRFVariableHyalinized glomeruliGranular or neg 