[A case of inflammatory pseudotumor of renal pelvis showing a complete response to antibiotics].

A 20-year-old woman was admitted with chief complaints of high fever and right lumbago. Abdominal computed tomography (CT) and ultrasonography revealed a right renal pelvic tumor 25 mm in diameter. Although malignancy could not be confirmed by the scan, we administered antibiotics based on a diagnosis of inflammatory pseudotumor of the renal pelvis.