The patient's pain repeatedly responded to a few days of quinolone therapy.
Differential for sterile pyuria:
- Renal TB: patient's husband had a history of active TB
- Interstitial nephritis: patient was taking a significant amount of NSAIDs and ASA for the back pain
- Nephrolithiasis: patient had calcifications in the kidney on the U/S
- Urogenital cancer
- Vaginal contamination
- Chlamydia, mycoplasma, ureaplasma (thanks Jim)