- Congenital seen in 1 in 500 live births
- Intrinsic narrowing of proximal ureter as it joins pelvis
- Congenital disruption of muscle development
- In 10% cases, aberrant or accessory renal artery crosses and obstructs proximal ureter
- Antenatal hydronephrosis detection
- Abdominal mass
- Intermittent flank pain
- Voiding cystourethrogram is used to rule out reflux disease
- Diuretic renography – DTPA or MAG3. Shows delayed radio tracer washout in obstructed system. Split function calculations help plan the need of any surgical intervention
Lawler, Leo P., et al. “Adult Ureteropelvic Junction Obstruction: Insights with Three-dimensional Multi–Detector Row CT.” Radiographics 25.1 (2005): 121-134.
Rouvière, Olivier, et al. “Ureteropelvic junction obstruction: use of helical CT for preoperative assessment—comparison with intraarterial angiography.” Radiology 213.3 (1999): 668-673.