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The above painting shows a glomerulus containing capillary loop fibrin thrombi, an arteriole with onion-skinning, and acute tubular injury, findings that can be seen in thrombotic microangiopathy. Morphologic findings of thrombotic microangiopathy that can be seen on a renal biopsy include arteriolar or capillary loop fibrin or platelet thrombi, red blood cell fragmentation within glomerular capillary loops or within arteries, mesangiolysis, endothelial cell swelling, glomerular basement membrane duplication, mucoid intimal edema of arteries, and a myointimal proliferation surrounding arterioles (onion-skinning like reaction). Thrombotic microangiopathy (TMA) has a wide clinical differential diagnosis, which can have substantial morphologic overlap on a kidney...