Weigert-Meyer rule illustration

Case contributed by Dr Matt Skalski

The image depicts a duplex collecting system with an obstructed upper pole moiety draining inferior and medially at the bladder with a ureterocele. The lower moiety is inserting at the expected location for the ureter. Often the lower ureter shows reflux, however I did not depict that here. 

Case Discussion

The illustration depicts many of the common features expected with a duplex collecting system, following the Weigert-Meyer rule

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