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Case Reports in Urology
Volume 2012, Article ID 919087, 3 pages
Case Report

IgG4 Inflammatory Pseudotumor of the Kidney

Department of Pathology, Immunology and Laboratory Medicine College of Medicine, University of Florida, P.O. Box 100275, Gainesville, FL 32610, USA

Received 6 July 2012; Accepted 17 September 2012

Academic Editors: S. J. Hong, H.-L. Lee, and A. Marte

Copyright © 2012 Ahmed N. Alkhasawneh and Robert W. Allan. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Hyper-IgG4 disease is a rare systemic disorder that usually affects middle age males. It is characterized by elevated serum IgG4 levels and infiltration of organs by IgG4 positive plasma cells associated with fibrosis. Patients usually present with mass or masses in the involved organ that mimic neoplasia. While initially described in the pancreas, IgG4-related inflammatory tumors have been now described in many organs. We describe an unusual case of an IgG4-related pseudotumor of the kidney.