- Etiology: congenital
- Weigert Meyer rule
- — Ureter draining upper pole inserts ectopically (abnormally) medial + inferior to lower pole moiety ureter and frequently ends in ureterocele which can cause ureteral obstruction + upper pole hydronephrosis + may insert into urethra or vagina
- — Ureter draining lower pole inserts in orthotopic (normal) trigonal position + is prone to reflux
- Imaging: drooping lily sign – obstructed nonfunctional upper pole moiety in duplex system displaces the functional opacified lower pole moiety inferolaterally
- US: interruption of central echogenic fat surrounding collecting system
Radiology Cases of Duplicated Kidney
