[A case of acute focal bacterial nephritis]

We report a case of acute focal bacterial nephritis (AFBN). A 30-year-old female patient visited Kyushu Rosai hospital with complaints of right flank pain and a fever of 3 days duration. She was immediately admitted, but still suffered from flank pain after 3 days of antibiotic therapy. Abdominal CT scan detected a focal mass lesion in the mid portion of the right kidney. Her clinical symptoms improved after 7 days of chemotherapy, and she was discharged. The mass lesion in the kidney disappeared after one month, she remained free of symptoms, and renal function was normal when followed up nineteen months later.