Quiz Page February 2016 American Journal of Kidney Diseases Isabelle Ayoub, MD, Salem Almaani, MD, Anthony Alvarado, MD, Samir V. Parikh, MD, Brad H. Rovin, MD  American Journal of Kidney Diseases  Volume 67, Issue 2, Pages A20-A23 (February 2016) DOI: 10.1053/j.ajkd.2015.10.017 Copyright © 2016 National Kidney Foundation, Inc. Terms and Conditions

Figure 1 Initial kidney biopsy. The biopsy specimen showed crescentic and necrotizing glomerulonephritis. Thirty-six glomeruli were present, with 34 having segmental necrotizing lesions and active cellular crescents. Two glomeruli with segmental necrosis and cellular crescent formation (arrows) are shown. There are red blood cell casts (∗) in the surrounding tubules (hematoxylin-eosin staining; original magnification, ×400). American Journal of Kidney Diseases 2016 67, A20-A23DOI: (10.1053/j.ajkd.2015.10.017) Copyright © 2016 National Kidney Foundation, Inc. Terms and Conditions

Figure 2 Repeat kidney biopsy (hematoxylin-eosin staining; original magnification, ×400). American Journal of Kidney Diseases 2016 67, A20-A23DOI: (10.1053/j.ajkd.2015.10.017) Copyright © 2016 National Kidney Foundation, Inc. Terms and Conditions