MONDO_0006821 (kidney papillary necrosis) is a complication of kidney diseases characterized by cell death involving kidney papilla in the kidney medulla. Damages to this area may hinder the kidney to concentrate urine resulting in polyuria. Sloughed off necrotic tissue may block kidney pelvis or ureter. Necrosis of multiple renal papillae can lead to kidney failure. Also known as: necrotizing renal papillitis, papillary necrosis, renal papillitis necrotizing.