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(A) Glomerulus from a patient with a glomerular form of atypical hemolytic uremic syndrome (aHUS). (B) Interlobular artery in a case of aHUS with severe vascular involvement. The vascular lumen is nearly fully occluded. Changes include myointimal proliferation. Thrombotic material and erythrocytes can be seen in the lumen and within the vascular wall.
