<prompt> All are causes of rapidly progressive glomerulo nephritis EXCEPTSLEPolyarteritis nodosaPost steptococcal GNRheomatoid arthritis  <response>: Rheumatic arthritis 977 - R 691 - HM 557-Basic pathology 8thFeaturesType -I RPGNAnti GBM diseaseType II RPGNImmune complexType III RPGNPauci immune GN1. Clinical syndromeNephriticNephriticNephritic2. Pathogenetic typeAnti GBMImmune complexPauci immune3. ImmunofluorescenceLinear Ig and C3Granular Ig and C3Sparse or absentIg and C34. Serological markersi Serum C3 levelii Anti - GBM antibodyiii ANCANormalPositiveNegativeLow to normalNegativeNegativeNormalNegativePositive5. Underlying causeIdiopathicGood pastures syndrome SLE, wegners granulomatosis, H.S purpuraIdiopathicPost infections post streptococcal GNIdiopathic PAN Wegners granulomatosis 