“Glomerular hemorrhage” in a kidney biopsy of a patient with crescentic glomerulonephritis and anti-MPO antibodies, in an almost normal glomerulus (top left), in a glomerulus with beginning extracapillary proliferation (top right), and in a glomerulus with chronic lesions (bottom left). At the bottom right, erythrocytes from a glomerulus are present in a tubule.