Sporadic unilateral papillary renal cell carcinoma masquerading pyelonephritis: A case report.

Hidden renal cell carcinoma (RCC) is not evident during severe inflammation such as acute pyelonephritis. We presented a 62-year-old male presenting with features of obstructive pyelonephritis managed with simple nephrectomy. However, the histopathology findings suggested unilateral papillary RCC.