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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).
also papillary necrosis tends to be the cause of these 4 (SAAD papa): Sickle cell, Acute pyelonephritis, Analgesics, Diabetes, which the patient does not have