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[The place of diagnostic imaging in xanthogranulomatous pyelonephritis].

The urographic, angiographic, sonographic and computed tomographic findings in 4 cases of xanthogranulomatous pyelonephritis are presented along with correlation with the pathological specimens. The parenchyma of the kidney was replaced by multiple, rounded, low-density respectively hypoechogenic areas on CT and sonography that corresponded to dilated calices and/or inflammatory tissue. For diagnosing the characteristic extrarenal extension of the disease sonography was not as accurate as CT.