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A CAT- Scan can't show very little issues, inflammation or very little stones. Therefore other examinations are necessary. In the firs place another test of your urine for bacteria and blood . Many bacteria are immune against Ciprofloxacin; maybe you need a change of antibiotics. Second there has to be an ultrasound to detect congestion in your urinary tract, and perhaps even a cystsocopy.
Please see your doctor to discuss with him the best procedure.
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