Text 23 Feb Upper Urinary Tract Anomales - Duplex Collecting System
  • Maldevelopment of valve mechanism of lower pole ureter - more direct course as orifice of ureter above and lateral to trigone which makes it more prone to reflux.
  • Ectopic insertion of upper pole moeity- medially and inferior. MALE - prostatic urethra and seminal vesicles most common;  FEMALE - Vestibule (end of vagina) and Vagina most common.
  • Duplicated collecting system - droopling lily sign (fewer than normal lower pole calyces and lateral deviation of proximal ureter due to medial location of dilated ureter from nonfunctioning upper pole)
  • Ectopic Ureterocele -usually associated with ectopic upper pole duplicated collection system.

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