The Observation Of Ureteral Anatomy And The Anatomic Study Of Pelvis CT

Objective To discuss ureteral stenosis and the imaging orientation pattern of pelvic ureter in CT horizontal section and acculate research data, so as to provide the evidence of the imaging orientation pattern of pelvic ureter in CT horizontal section. Methods (1) Dissect 30 ureters of full-grown cadavers (20 males, 10 females), observe the number and location of ureteral stenosis and measure the inner diameter of ureteral stenosis. To choose 30 cases of male and female enhanced scanning pelvis CT and measure the location and the distance between ureter and iliac blood vessel and lumbosacral vertebra. Results Different sections of ureter are in various shapes, and can be classified as four categories.The degree of ureter stenosis is as follows: internal bladder wall >distal ureter >middle ureter>upper ureter. The 50% first stenosis is located in the ureteropelvic junction and another 50% is located in the upper ureter. The results of pelvic ureter CT are the followings: In the 1st, 2nd and 3rd layers, the ureter gradually closes to iliac vessel from the outer part of iliac artery externa and locates in the front or out-front of iliac artery. In the right part of the 2nd horizontal section, the distance between female ureter and iliac anterry externa is shorter than that of males and has significant difference (p<0.01). The orientation of left ureter to iliac artery externa of females is slightly outer compared with males, who have a more fronter position. There is a distinct difference (p<0.01). In the 3rd horizontal section, there are differences in the location and distance of both male and females' right ureter and iliac blood vessels (p<0.05,p<0.01). In the 4th horizontal section, the location of ureter and iliac artery is different in both left and right sides (p<0.05, p<0.01). In the 5th,6th,7th horizontal section, the distance between ureter and iliac artery is becoming far and far and the clock orientation is 5:03-6:35 (right side) and 6:42-7:00 (left side) to the iliac artery. In the 7 horizontal section measured, thedistance between males' ureter and lumbosacral vertebra is shorter than that of females and a little outer. There is no statistical significance. Conclusions The number of ureter stenosis are not definite, and the location of ureter stenosis arc also not definite except the ureter stenosis in the inner bladder wall. The most stenotic part is in the inner bladder wall. 50% of the 1st ureter stenosis is located in the ureteropelvic junctioa In pelvic CT horizontal section, iliac blood vessels and lumbosacral vertebra can be served as a reference to locate ureter.