RPGN occurs in A/E -

Rapidly progressive glomerulonephritis (RPGN) is characterised by rapid loss of renal function over days to weeks, usually in association with hypeension and oedema. Non-visible haematuria is almost always present with variable amounts of proteinuria, while characteristic red cell casts and dysmorphic red cells may be observed on urine microscopy . Renal biopsy typically shows crescentic lesions , often associated with necrotising lesions within the glomerulus , paicularly in small-vessel vasculitides. This pattern of presentation is typical of post-infectious glomerulonephritis, anti-GBM disease and small-vessel vasculitides . It can also be observed in SLE and occasionally in IgA and other nephropathies . Also seen in diabetic nephropathies Ref Harrison20th edition pg 234