[A CASE OF XANTHOGRANULOMATOUS PYELONEPHRITIS ASSOCIATED WITH CHROMOPHOBE RENAL CELL CARCINOMA]

Xanthogranulomatous pyelonephritis (XGP) is a type of chronic suppurative renal inflammation. We present an extremely rare case of XGP concomitant with chromophobe renal cell carcinoma (RCC). A-39-year-old woman presented with transient fever and left lower abdominal pain during steroid pulse therapy for thyroid eye disease. Imaging studies including contrast-enhanced computed tomography, magnetic resonance imaging, and doppler ultrasonography, showed a 40 mm unusual mass lesion in the upper pole of the left kidney, and we could not rule out the possibility of malignancy.A left open partial nephrectomy for the renal mass was performed. Pathological examination revealed a 5 mm chromophobe RCC located beside a 30 mm XGP. The patient presented a favorable course without inflammatory episodes or tumor recurrence during the 9-month follow-up. This is the first case report of the coexistent XGP and chromophobe RCC.