Quiz Page January 2016 American Journal of Kidney Diseases James Collett, MBBS, Stephen Fuller, MBBS, PhD, Chow Heok P’Ng, MBBS, Muralikrishna Gangadharan Komala, MBBS  American Journal of Kidney Diseases  Volume 67, Issue 1, Pages A18-A21 (January 2016) DOI: 10.1053/j.ajkd.2015.09.018 Copyright © 2016 National Kidney Foundation, Inc. Terms and Conditions

Figure 1 Urine cytology shows a decoy cell (arrow) (original magnification, ×400). Image courtesy of A. Hadji-Ashrafy. American Journal of Kidney Diseases 2016 67, A18-A21DOI: (10.1053/j.ajkd.2015.09.018) Copyright © 2016 National Kidney Foundation, Inc. Terms and Conditions

Figure 2 Kidney biopsy specimen shows distorted tubules. Arrows indicate tubular epithelial cells showing viral cytopathic effect (hematoxylin and eosin stain; original magnification, ×400). American Journal of Kidney Diseases 2016 67, A18-A21DOI: (10.1053/j.ajkd.2015.09.018) Copyright © 2016 National Kidney Foundation, Inc. Terms and Conditions

Figure 3 Immunohistochemical stain of kidney biopsy specimen for polyomavirus, using an antibody against SV40 antibody. Arrows show positive nuclei (original magnification, ×200). American Journal of Kidney Diseases 2016 67, A18-A21DOI: (10.1053/j.ajkd.2015.09.018) Copyright © 2016 National Kidney Foundation, Inc. Terms and Conditions

Figure 4 Kidney biopsy specimen shows marked chronic tubulointerstitial inflammation with prominent lymphocytes suggestive of involvement by chronic lymphocytic leukemia/small lymphocytic lymphoma (hematoxylin and eosin stain; original magnification, ×200). American Journal of Kidney Diseases 2016 67, A18-A21DOI: (10.1053/j.ajkd.2015.09.018) Copyright © 2016 National Kidney Foundation, Inc. Terms and Conditions