Duplicated Kidney

  • Etiology: congenital
  • Weigert Meyer rule
    — Ureter draining lower pole inserts in orthotopic (normal) trigonal position + is prone to reflux
    — Ureter draining upper pole inserts ectopically (abnormaly) medial + inferior to lower pole moiety ureter and frequently ends in ureterocele which can cause obstruction + may insert into vagina or rectum
  • Imaging: drooping lily sign – obstructed nonfunctional upper pole in duplex system is displaced laterally
  • US: interruption of echogenic fat surrounding collecting sysem

Cases of Duplicated Kidney