Xanthogranulomatosis is an idiopathic, rare process in which lipid-laden hi
stiocytes may deposit in various locations in the body, which if systemic i
s called Erdheim-Chester disease. A rare case of isolated retroperitoneal,
bilateral perinephric xanthogranulomatosis is reported. The diagnosis was s
uspected on cross-sectional imaging and was confirmed by CT-guided percutan
eous core biopsy. (C) 2000 Elsevier Science Inc. All rights reserved.