Cresentic G.N.

It is a type of G.N. presented with rapidly progressive G.N.
i.e. severe nephritic $ with RBC casts and dysmorphic RBCs with renal failure developing within weeks to months and diffuse glomerular crescent formation.

Idiopathic good pasture $ (anti - GBMAb mediated)
Immune complex mediated e.g. SLE, post infections.
ANCA mediated e.g. vasculitides.(wegener’s granuloma & microscopic P.A.N)

Source: Internal Medicine Book of Dr.Osama Mahmoud (Ain Shams University)