A 74-year-old female with a history of diabetes mellitus, hypertension, dyslipidemia, and ischemic stroke, with a sequela of right hemiparesis, presented to our emergency room with fever, lower abdominal pain, and confused consciousness for one day. No cough, vomiting, diarrhea, or flank pain was present. Her blood urea nitrogen concentration was 57.2mg/dl and the serum creatinine concentration was 1.7mg/dl. Other laboratory tests showed an elevated white blood cell count of 27.42×109/l with 4% band forms and C-reactive protein of 15.4mg/dl.