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