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Figure 9b. Drawings show left UPJO with hydronephrosis in which the dilated extrarenal pelvis and proximal ureter bow anteriorly (a) or posteriorly (b) over the lower-pole segmental artery. Note that, when there is significant hydronephrosis, the UPJO site is frequently more cephalad behind the overgrown pelvis. UPJ = ureteropelvic junction.
