Which of the following is Type III RPGN: (A) SLE, (B) IgA nephropathy, (C) Granulomatosis with polyangitis, (D) Cryoglobulinemia
Answer is C. Type III RPGN is the most common type of RPGN. It is "pauci immune type". It doesn't have either anti-GBM antibodies or immune complexes. It is ANCA associated hence the examples are Granulomatosis with polyangitis, microscopic polyangitis.