<prompt> Which of the following is associated with pauci-immune glomerulonephritis?SLE nephritisAnti-GBM glomerulonephritisIgA nephropathyGranulomatosis with polyangiitis GPA  <response>: Rapidly progressive glomerulonephritis RPGNCrescentic glomerulonephritis is broadly divided into 3 categories: Anti-GBM glomerulonephritis - Linear glomerular IgG IF staining Goodpasture syndrome has anti-GBM lesion along with pulmonary hemorrhage Immune complex mediated glomerulonephritis - Glomerular immune complex localization with granular IF IgA nephropathy Fibrillary GN Membranous GN Type I and II MPGN Acute post-infectious GN Lupus nephritis Henoch-Schonlein purpura Pauci-immune glomerulonephritis - Paucity of glomerular IF immunoglobulin staining; Serology: ANCA ANCA GN Microscopic polyangiitis Wegener granulomatosis Granulomatosis with polyangiitis GPA Churg-Strauss syndrome 