<unk>  <unk>  is a syndrome of the kidney that is characterized by a rapid loss of kidney function, (usually a 50% decline in the glomerular filtration rate (GFR) within 3 months) with glomerular crescent formation seen in at least 50% or 75% of glomeruli seen on kidney biopsies. If left untreated, it<unk>  progresses into acute kidney failure and death within months. In 50% of cases,<unk>  is associated with an underlying disease such as Goodpasture syndrome, systemic lupus erythematosus or granulomatosis with polyangiitis; the remaining cases are idiopathic. Regardless of the underlying cause,<unk>  involves severe injury to the kidneys' glomeruli, with many of the glomeruli containing characteristic glomerular crescents (crescent-shaped scars).
Rapidly progressive glomerulonephritis
Focal proliferative nephritis
Diffuse proliferative nephritis
Transplant glomerulopathy
Membranous glomerulonephritis
Membranoproliferative glomerulonephritis
Acute proliferative glomerulonephritis
Mesangial proliferative glomerulonephritis