renal papillary necrosis


Look at the papillae in this kidney. Notice the pale grey infarcted like zones in the papillae surrounded by an ischemic zone. These are actually regions of necrosis, so-called renal papillary necrosis, probably due to ischemia of the papillae. This occurs in people with vascular disease often diabetics and particularly in the presence of pyelonephritis.
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