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submitted by ap88(0),

Why can this not be papillary necrosis? Given the gross Hematuria and proteinuria with a history of analgesic use... I thought that was what this was getting at?

biaancadb  I was confused about this too. Only thing I had to go on is that I wrote down from somewhere that you see papillary necrosis in middle-aged adults and that it's uncommon in children (except those with sickle cell). Also I'm assuming PSGN is technically a proliferative glomerulonephritis since on FA pg. 578 the definition of proliferative is "hypercellular glomeruli", and for PSGN, you see hypercellular glomeruli on LM (due to leukocyte infiltration). +1