From the case:
Weigert-Meyer rule illustration
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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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