Bilateral UPJO: When There Is No Normal Kidney

Bilateral UPJO is not simply unilateral UPJO on both sides. It removes the normal reference kidney and makes differential renal function harder to trust.In this episode, we discuss why balanced DRF can be misleading, how parenchymal loss and trajectory may matter more than symmetry, and when staged unilateral repair is reasonable versus when urgent bilateral action may be needed.The central idea: in bilateral UPJO, the safest question is not “which kidney is worse?” but “is the child’s total renal system safe?”Keywords: UPJO, bilateral hydronephrosis, pyeloplasty, differential renal function, pediatric urology, renal injury.