[The imaging of chronic renal infections]

From pathological point of view the chronic renal infections include two types, interstitial chronic pyelonephritis and granulomatous pyelonephritis, namely xanthogranulomatous, malacoplakia and renal tuberculosis. Indications for imaging modalities are more common compared to the acute types and allow to depict both factors causing obstruction and infection such as stones ant the renal and extrarenal extension of the disease. In this article the authors review the findings and the role of plain film and urography, computed tomography and ultrasonography.