| ureteropelvic junction | Site of origin of the ureter from the renal pelvis, a common location for congenital or acquired obstruction. (05 Mar 2000) |
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| ureteropelvic junction obstruction | <urology> A blockage of a ureter in the region where the ureter enters the anatomic pelvis (close to the bladder). This is caused most often by a kidney stone but can also be caused by external (or internal) compression from a tumour. (27 Sep 1997) |