RPGN is caused by

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 9/e Pg 912