The micrograph shows viable renal parenchyma on the left of the field and infarcted parenchyma in the middle and to the right. Necrotic infarcted tissue lacks staining and definition of structures.
Most renal infarcts are the result of embolized thrombi that lodge in renal arterial vessels.
The epidemiology is that of the primary disease process affecting the heart, i.e, atherosclerotic cardiovascular disease, infectious endocarditis. On cut section, renal infarcts are triangular with the base at the cortical surface and the apex pointing towards the medulla and the occluded artery. A day or so after occlusion, the infarct appears pale compared to adjacent parenchyma. Old resolved infarcts on cut section show a V shape absence of renal parenchyma. Heal by scarring.