A case of a 38 years old man with xanthogranulomatous pyelonephritis is presented. The ultrasound examination of the abdomen found a tumorous formation above the left kidney. Arterial hypertension and changes in the lipid metabolism were found clinically. The i. v. urography revealed more characteristic changes. The diagnosis xanthogranulomatous pyelonephritis is based on the computed tomography findings and the clinico-laboratory examinations.