84 year old male, s/P 16 months post prostate cancer treatment. I.E. used radiation treatment. Patient started to complain of problems with voiding, frequency, urgency. Rushed to ED room due to blood in urine and difficulty getting flow started. 3/5/13 cystoscopy done, outpatient procedure, 3/18/13 follow up with urologist for another dilation in the office. Now this provider wants to do a DVIU? is this necessary?