A 75-year-old man was admitted to our hospital with a complaint of fever and backpain. He was diagnosed with acute pyelonephritis, and was administered an antibiotic. However, since there was no improvement in the symptoms, he was admitted to our hospital. Computed tomography revealed a tumor which was in contact with a thoracic vertebra. Because he had had a total cystectomy for bladder cancer in the past, we suspected a spinal metastasis of urothelial carcinoma. However, after magnetic resonance imaging, we finally diagnosed it as pyogenic spondylodiscitis, and his condition improved after administration of antibiotics.