ABSTRACT
Two conservatively treated cases of xanthogranulomatous pyelonephritis are reported here. The first case was a 31-year-old diabetic woman. She was referred to our department. Examinations for gross hematuria were made. US, CT and MRI revealed a renal tumor in the upper pole of the left kidney. The second case was an 86-year-old man with ileal conduit. He complained about pain in the right back. A mass of fist size was found. US, CT and MRI revealed right hydronephrosis connected to the subcutaneous tumor on the right back, and DIP revealed no-functioning right kidney. Because both cases showed some signs of inflammation in laboratory findings, we performed biopsy. Either of the two cases were pathologically diagnosed as xanthogranulomatous pyelonephritis. For this reason, Antibiotic therapy was continued. As a result, reduction of the tumors was seen. The prognosis was good.