A total of 15 patients with suspected urethral stricture or fistula underwent conventional retrograde urethrograhpy & following sonourethrography with saline infusion or voiding again-st Eschmann penile clamp in Gyeongsang & Chungnam National University Hospital from July 1988 to June 1989. the sonographic findings were as diagnostic as the roentgen findings in 12 patients. When the length of the strictures assessed by each imaging modality was compared to measurement at open urothroplasty of 2 patients sonourethrography was consistently more accurate. Urethroscopy was done in all cases. Sonourethrography using distension technique of the urethra enabled classification of the degree of spongilfibrosis thus provided the guidande of direct vision internal urethrotomy in 9 patients. In2 parients, the sonourthrogram identified periurethral tumor & urethral polyp which were not definitely analysed on the retrograde urethrgram. In the patient of posttraumatic postoprative urethrorectal fistula residual fistuous tract was seen on both examinations In 1 patient of stricture with severe periurethral scar urethral stricture recurred after graft No patient reported significant discomfort during the sonourethrogram. The sonourethrogram provided valuable dynamic 3-dimensional information about the lum-inal & extraluminal anatomy & pathology of the anterior urethra. The new method of sonourethrogram allows for the appropriate decision to be made easier for optimal treatment of urethal stricture etc, and can be used as a follow-up study,