Case Review: VCUG & Ultrasound of Duplicated Collecting System - a podcast by Daniel J. Kowal, MD

In this radiology lecture, we discuss the imaging appearance of duplicated collecting system and ureterocele, with attention to US and VCUG.

Key points include:



* Weigert-Meyer rule: Remember the mnemonic “DUMI.”

* With duplex kidneys and complete ureteral Duplication, ureter draining Upper pole inserts ectopically into bladder Medially and Inferiorly to ureter draining lower pole.

* Lower pole moiety inserts orthotopically.

* Upper pole moiety often ends as an ectopic ureterocele.

* Upper pole moiety tends to obstruct, and lower pole moiety is prone to reflux.

* Obstructed upper pole moiety causes mass effect with resultant inferior displacement of the lower pole moiety and the “drooping lily” sign.



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