<prompt> RPGN is caused byWegeners granulomatosisGood pasteur syndromeMicroscopic polyangitisAll of the above  <response>: Refer Robbins pageRapidly progressive glomerulonephritis RPGN is a syndrome associated with severe glomerular injury, but does not denote a specific etiologic form of glomerulone- phritis. It is characterized by rapid and progressive loss of renal function associated with severe oliguria and signs of nephritic syndrome; if untreated, death from renal failure occurs within weeks to months. The most common histologic picture is the presence of crescents in most of the glomeruli crescentic glomerulonephritis no 9e Pg 912 